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5*x-(12/3) = 131/13 // - 131/13
5*x-(12/3)-(131/13) = 0
5*x-131/13-4 = 0
5*x-183/13 = 0 // + 183/13
5*x = 183/13 // : 5
x = 183/13/5
x = 183/65
x = 183/65
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