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(4*(x-11))/3 = 12 // - 12
(4*(x-11))/3-12 = 0
(4*(x-11))/3+(-12*3)/3 = 0
4*(x-11)-12*3 = 0
4*x-80 = 0
(4*x-80)/3 = 0
(4*x-80)/3 = 0 // * 3
4*x-80 = 0
4*x-80 = 0 // + 80
4*x = 80 // : 4
x = 80/4
x = 20
x = 20
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