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(1/5)*x+1/7 = 40 // - 40
(1/5)*x+1/7-40 = 0
1/5*x-279/7 = 0 // + 279/7
1/5*x = 279/7 // : 1/5
x = 279/7/1/5
x = 1395/7
x = 1395/7
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