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(3*(x-3))/2 = 6 // - 6
(3*(x-3))/2-6 = 0
(3*(x-3))/2+(-6*2)/2 = 0
3*(x-3)-6*2 = 0
3*x-21 = 0
(3*x-21)/2 = 0
(3*x-21)/2 = 0 // * 2
3*x-21 = 0
3*x-21 = 0 // + 21
3*x = 21 // : 3
x = 21/3
x = 7
x = 7
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