Exercises 137–139 will help you prepare for the material covered in the next section. Solve for x: a(x - 2) = b(2x + 3)

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Start with the given equation:

a (x - 2) = b (2 x + 3)

Apply the distributive property to both sides to eliminate the parentheses:

a x - 2 a = 2 b x + 3 b

Group all terms containing

x

on one side and constant terms on the other side. For example, subtract

2 b x

from both sides and add

2 a

to both sides:

a x - 2 b x = 3 b + 2 a

Factor out

x

on the left side:

x (a - 2 b) = 3 b + 2 a

Finally, solve for

x

by dividing both sides by

a - 2 b

, assuming it is not zero:

x = \frac{3 b + 2 a}{a - 2 b}

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Distributive Property

The distributive property allows you to multiply a single term by each term inside a parenthesis. For example, a(x - 2) becomes ax - 2a. This step is essential to simplify both sides of the equation before solving for x.

Solving Linear Equations

Solving linear equations involves isolating the variable on one side to find its value. After simplifying both sides, combine like terms and use inverse operations such as addition, subtraction, multiplication, or division to solve for x.

Combining Like Terms

Combining like terms means adding or subtracting terms that have the same variable raised to the same power. This simplifies the equation and makes it easier to isolate the variable and solve the equation.