3x + 5x = 40, donc 8x = 40, et x = 5.

Solving the Simple Linear Equation: How 3x + 5x = 40 Leads to x = 5

Learning basic algebra helps build stronger problem-solving skills, even in simple equations. One of the most straightforward examples is solving the equation 3x + 5x = 40, which quickly reveals the value of x—and shows how powerful basic math can be.

Breaking Down the Equation

Understanding the Context

Start with the equation:
3x + 5x = 40

Notice that both terms on the left involve x. We can combine like terms:
3x + 5x combines to 8x, giving us:
8x = 40

This step simplifies the problem by grouping similar elements, making it easier to isolate x.

Solving for x

Key Insights

Now, to find x, divide both sides of the equation by 8:
x = 40 ÷ 8
x = 5

This straightforward division confirms that when we add 3x and 5x, the total equals 40 only if x = 5.

Why This Equation Matters

At first glance, 3x + 5x = 40 might seem simple, but it illustrates key algebraic principles: combining like terms, solving for a variable, and checking results. These skills form the building blocks for more complex math, including equations used in science, engineering, and finance.

Final Check

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Final Thoughts

To verify, substitute x = 5 back into the original equation:
3(5) + 5(5) = 15 + 25 = 40, which is correct.

Conclusion

Solving 3x + 5x = 40 and finding x = 5 demonstrates how clear, step-by-step reasoning transforms a basic equation into a confident conclusion. Whether you're a student or brushing up on fundamentals, mastering such equations strengthens logical thinking and sets the stage for tackling advanced math challenges.

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