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(2*x+3*x-6)/4 = 12 // - 12
(2*x+3*x-6)/4-12 = 0
(5*x-6)/4-12 = 0
(5*x-6)/4+(-12*4)/4 = 0
5*x-12*4-6 = 0
5*x-54 = 0
(5*x-54)/4 = 0
(5*x-54)/4 = 0 // * 4
5*x-54 = 0
5*x-54 = 0 // + 54
5*x = 54 // : 5
x = 54/5
x = 54/5
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