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(5*(x-8))/7 = -7 // + 7
(5*(x-8))/7+7 = 0
(5*(x-8))/7+(7^2)/7 = 0
5*(x-8)+49 = 0
5*x+9 = 0
(5*x+9)/7 = 0
(5*x+9)/7 = 0 // * 7
5*x+9 = 0
5*x+9 = 0 // - 9
5*x = -9 // : 5
x = -9/5
x = -9/5
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