We are given the following equation and asked to solve for $x$: $$ \frac{3}{x-m} - \frac{2}{x+m} = \frac{3x-7m}{x^2 - m^2} $$

AlgebraEquationsRational ExpressionsSolving Equations
2025/5/25

1. Problem Description

We are given the following equation and asked to solve for xx:
3xm2x+m=3x7mx2m2 \frac{3}{x-m} - \frac{2}{x+m} = \frac{3x-7m}{x^2 - m^2}

2. Solution Steps

First, we note that x2m2=(xm)(x+m)x^2 - m^2 = (x-m)(x+m). Thus, the common denominator for the left-hand side is also x2m2x^2 - m^2.
We rewrite the left-hand side with the common denominator:
3(x+m)(xm)(x+m)2(xm)(x+m)(xm)=3x+3m(2x2m)x2m2 \frac{3(x+m)}{(x-m)(x+m)} - \frac{2(x-m)}{(x+m)(x-m)} = \frac{3x+3m - (2x - 2m)}{x^2 - m^2}
3x+3m2x+2mx2m2=x+5mx2m2 \frac{3x + 3m - 2x + 2m}{x^2 - m^2} = \frac{x + 5m}{x^2 - m^2}
Now, we have the equation:
x+5mx2m2=3x7mx2m2 \frac{x + 5m}{x^2 - m^2} = \frac{3x - 7m}{x^2 - m^2}
If x2m20x^2 - m^2 \neq 0, then we can multiply both sides by x2m2x^2 - m^2, giving us:
x+5m=3x7m x + 5m = 3x - 7m
Now we solve for xx:
12m=2x 12m = 2x
x=6m x = 6m
Since we multiplied by x2m2x^2 - m^2, we need to check if x=6mx=6m makes the denominator 00.
x2m2=(6m)2m2=36m2m2=35m2x^2 - m^2 = (6m)^2 - m^2 = 36m^2 - m^2 = 35m^2.
If m=0m=0, then x=0x=0, but the original equation becomes 3x2x=3xx2\frac{3}{x} - \frac{2}{x} = \frac{3x}{x^2}, which simplifies to 1x=3x\frac{1}{x} = \frac{3}{x}. This implies 1=31=3, which is false. Therefore, m0m \neq 0.
Thus, if m0m \neq 0, then x=6mx = 6m is a solution.

3. Final Answer

x=6mx = 6m

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