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(1*(2*x-4))/3 = 12 // - 12
(1*(2*x-4))/3-12 = 0
(2*x-4)/3-12 = 0
(2*x-4)/3+(-12*3)/3 = 0
2*x-12*3-4 = 0
2*x-40 = 0
(2*x-40)/3 = 0
(2*x-40)/3 = 0 // * 3
2*x-40 = 0
2*x-40 = 0 // + 40
2*x = 40 // : 2
x = 40/2
x = 20
x = 20
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