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3*(x-2) = (5/7)*(3*x+3)+3 // - (5/7)*(3*x+3)+3
3*(x-2)-((5/7)*(3*x+3))-3 = 0
3*(x-2)+(-5/7)*(3*x+3)-3 = 0
3*(x-2)-5/7*(3*x+3)-3 = 0
3*(x-2)-5/7*(3*x+3)-3 = 0
6/7*x-57/7-3 = 0
6/7*x-78/7 = 0
6/7*x-78/7 = 0
6/7*x-78/7 = 0 // + 78/7
6/7*x = 78/7 // : 6/7
x = 78/7/6/7
x = 13
x = 13
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