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(4/5)*x-1 = 112/5-7*x // - 112/5-7*x
(4/5)*x-(-7*x)-(112/5)-1 = 0
(4/5)*x+7*x-112/5-1 = 0
39/5*x-117/5 = 0 // + 117/5
39/5*x = 117/5 // : 39/5
x = 117/5/39/5
x = 3
x = 3
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