3x - 12 + 10 - 2x = 10 - Coaching Toolbox
Solving the Linear Equation: 3x – 12 + 10 – 2x = 10
Solving the Linear Equation: 3x – 12 + 10 – 2x = 10
Mathematics comes to life in many forms — one of the most fundamental is solving linear equations. If you’ve ever encountered an expression like 3x – 12 + 10 – 2x = 10, you’re facing a classic algebraic challenge. In this guide, we’ll break down how to solve 3x – 12 + 10 – 2x = 10 step by step, explain the reasoning behind each move, and show you how to master similar equations in real life. Whether you're a student, educator, or simply curious about algebra, this article will help you understand not just how to solve it — but why it works.
Understanding the Context
What Is the Equation?
Let’s start with the equation:
3x – 12 + 10 – 2x = 10
At first glance, the presence of x and constant numbers might seem overwhelming. But simple algebra helps us simplify and isolate x. By combining like terms and simplifying both sides, we transform the equation into a straightforward expression: x = 12. That’s the solution — but understanding how we reach it is what truly matters.
Step-by-Step Solution
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Key Insights
Step 1: Combine Like Terms
We begin by simplifying all the numerical and variable terms on the left side. The terms involving x are 3x – 2x, and the constants are –12 + 10.
- Combine the x-terms:
3x – 2x = x - Combine the constants:
–12 + 10 = –2
Now the equation becomes:
x – 2 = 10
Step 2: Isolate the Variable x
To solve for x, we need all x-terms on one side and constants on the other. Add 2 to both sides to move –2 away:
x – 2 + 2 = 10 + 2
x = 12
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Check the Solution
Always verify by plugging x = 12 back into the original equation:
3(12) – 12 + 10 – 2(12) = 10
Calculate step by step:
→ 36 – 12 + 10 – 24 = 10
→ (36 – 12) + (10 – 24) = 10
→ 24 + (–14) = 10
→ 10 = 10 ✅
The equation checks out — our solution is correct!
Why This Equation Matters — Practical Applications
While 3x – 12 + 10 – 2x = 10 is abstract, equations like this are foundational in modeling real-world situations. They help in:
- Finance: Calculating break-even points where income equals expenses
- Physics: Modeling motion with constant rates
- Computer Science: Preparing logic for algorithms across platforms
- Everyday Problem-Solving: Scaling recipes, comparing billing plans, budgeting
Learning Takeaways
Solving 3x – 12 + 10 – 2x = 10 teaches essential algebra skills:
- Combining like terms reduces complexity
- Isolating variables is the heart of solving equations
- Verification ensures accuracy
- Pattern recognition applies across math and real life
