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(x+7)/5+(x-5)/3 = 0
(3*(x+7))/(3*5)+(5*(x-5))/(3*5) = 0
3*(x+7)+5*(x-5) = 0
8*x-4 = 0
(8*x-4)/(3*5) = 0
(8*x-4)/(3*5) = 0 // * 3*5
8*x-4 = 0
8*x-4 = 0 // + 4
8*x = 4 // : 8
x = 4/8
x = 1/2
x = 1/2
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