Find: x minus 1 / 5 + x minus 1 / 9 = x minus 1 / 8 + x minus 1 / 6

1/（x-5）+1/（x-9）=1/（x-8）+1/（x-6）
Multiply by (X-5) (X-9) (X-8) (X-6)
（x-8）（x-6）【（x-9）+（x-5）】=（x-5）（x-9）【（x-6）+（x-8）】
（2x-14）（x-8）（x-6）=（x-5）（x-9）（2x-14）
（2x-14）【（x^2-14x+48）-(x^2-14x+45)】=0
（2x-14）*3=0
So x = 7

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