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(8*x-(3*x)-4)/5 = 12 // - 12
(8*x-(3*x)-4)/5-12 = 0
(8*x-3*x-4)/5-12 = 0
(5*x-4)/5-12 = 0
(5*x-4)/5+(-12*5)/5 = 0
5*x-12*5-4 = 0
5*x-64 = 0
(5*x-64)/5 = 0
(5*x-64)/5 = 0 // * 5
5*x-64 = 0
5*x-64 = 0 // + 64
5*x = 64 // : 5
x = 64/5
x = 64/5
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