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7*x+6*x-1 = 8/5 // - 8/5
7*x+6*x-(8/5)-1 = 0
7*x+6*x-8/5-1 = 0
13*x-13/5 = 0 // + 13/5
13*x = 13/5 // : 13
x = 13/5/13
x = 1/5
x = 1/5
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