We are asked to solve the equation $\frac{1}{x-3} + \frac{1}{x-4} = \frac{5}{x^2 - 7x + 12}$ for $x$.

AlgebraAlgebraic EquationsRational EquationsEquation SolvingFactorization
2025/4/19

1. Problem Description

We are asked to solve the equation 1x3+1x4=5x27x+12\frac{1}{x-3} + \frac{1}{x-4} = \frac{5}{x^2 - 7x + 12} for xx.

2. Solution Steps

First, factor the denominator on the right side of the equation:
x27x+12=(x3)(x4)x^2 - 7x + 12 = (x-3)(x-4)
So the equation becomes:
1x3+1x4=5(x3)(x4)\frac{1}{x-3} + \frac{1}{x-4} = \frac{5}{(x-3)(x-4)}
Next, find a common denominator for the left side of the equation:
1(x4)(x3)(x4)+1(x3)(x4)(x3)=5(x3)(x4)\frac{1(x-4)}{(x-3)(x-4)} + \frac{1(x-3)}{(x-4)(x-3)} = \frac{5}{(x-3)(x-4)}
Combine the fractions on the left:
x4+x3(x3)(x4)=5(x3)(x4)\frac{x-4+x-3}{(x-3)(x-4)} = \frac{5}{(x-3)(x-4)}
Simplify the numerator on the left:
2x7(x3)(x4)=5(x3)(x4)\frac{2x-7}{(x-3)(x-4)} = \frac{5}{(x-3)(x-4)}
Since the denominators are equal, we can equate the numerators:
2x7=52x - 7 = 5
Add 7 to both sides of the equation:
2x=122x = 12
Divide both sides by 2:
x=6x = 6
We need to check if x=6x=6 is a valid solution by ensuring it doesn't make any of the denominators zero.
x3=63=30x-3 = 6-3 = 3 \neq 0
x4=64=20x-4 = 6-4 = 2 \neq 0
x27x+12=(6)27(6)+12=3642+12=60x^2 - 7x + 12 = (6)^2 - 7(6) + 12 = 36 - 42 + 12 = 6 \neq 0
Since none of the denominators are zero when x=6x=6, the solution is valid.

3. Final Answer

x=6x = 6

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