We need to solve the linear equation $\frac{1}{3}x - 9 = \frac{1}{5}x - 7$ for $x$.

AlgebraLinear EquationsEquation SolvingFractions
2025/4/28

1. Problem Description

We need to solve the linear equation 13x9=15x7\frac{1}{3}x - 9 = \frac{1}{5}x - 7 for xx.

2. Solution Steps

First, add 9 to both sides of the equation to isolate the x terms on one side and the constants on the other.
13x9+9=15x7+9\frac{1}{3}x - 9 + 9 = \frac{1}{5}x - 7 + 9
13x=15x+2\frac{1}{3}x = \frac{1}{5}x + 2
Next, subtract 15x\frac{1}{5}x from both sides of the equation:
13x15x=15x+215x\frac{1}{3}x - \frac{1}{5}x = \frac{1}{5}x + 2 - \frac{1}{5}x
13x15x=2\frac{1}{3}x - \frac{1}{5}x = 2
Find a common denominator for the fractions, which is
1

5. $\frac{5}{15}x - \frac{3}{15}x = 2$

5315x=2\frac{5-3}{15}x = 2
215x=2\frac{2}{15}x = 2
Now, multiply both sides of the equation by 152\frac{15}{2} to isolate x.
152215x=2152\frac{15}{2} \cdot \frac{2}{15}x = 2 \cdot \frac{15}{2}
x=15x = 15

3. Final Answer

x=15x = 15

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