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3*x-(2*(-3/13)) = 4 // - 4
3*x-(2*(-3/13))-4 = 0
3*x+6/13-4 = 0
3*x-46/13 = 0 // + 46/13
3*x = 46/13 // : 3
x = 46/13/3
x = 46/39
x = 46/39
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