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(2*(x-1))/3 = 4 // - 4
(2*(x-1))/3-4 = 0
(2*(x-1))/3+(-4*3)/3 = 0
2*(x-1)-4*3 = 0
2*x-14 = 0
(2*x-14)/3 = 0
(2*x-14)/3 = 0 // * 3
2*x-14 = 0
2*x-14 = 0 // + 14
2*x = 14 // : 2
x = 14/2
x = 7
x = 7
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