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6*x+7*x-2/5 = 61/10 // - 61/10
6*x+7*x-2/5-(61/10) = 0
6*x+7*x-2/5-61/10 = 0
13*x-13/2 = 0 // + 13/2
13*x = 13/2 // : 13
x = 13/2/13
x = 1/2
x = 1/2
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