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