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90*x-(5*x) = 1/7 // - 1/7
90*x-(5*x)-(1/7) = 0
90*x-5*x-1/7 = 0
85*x-1/7 = 0 // + 1/7
85*x = 1/7 // : 85
x = 1/7/85
x = 1/595
x = 1/595
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