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(2*(x-9))/3 = 4 // - 4
(2*(x-9))/3-4 = 0
(2*(x-9))/3+(-4*3)/3 = 0
2*(x-9)-4*3 = 0
2*x-30 = 0
(2*x-30)/3 = 0
(2*x-30)/3 = 0 // * 3
2*x-30 = 0
2*x-30 = 0 // + 30
2*x = 30 // : 2
x = 30/2
x = 15
x = 15
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