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(4/5)*(x-1) = 25 // - 25
(4/5)*(x-1)-25 = 0
4/5*(x-1)-25 = 0
4/5*(x-1)-25 = 0
4/5*x-129/5 = 0
4/5*x-129/5 = 0
4/5*x-129/5 = 0 // + 129/5
4/5*x = 129/5 // : 4/5
x = 129/5/4/5
x = 129/4
x = 129/4
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