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(x-4)/2 = x // - x
(x-4)/2-x = 0
(x-4)/2+(2*(-x))/2 = 0
x+2*(-x)-4 = 0
-x-4 = 0
(-x-4)/2 = 0
(-x-4)/2 = 0 // * 2
-x-4 = 0
-x-4 = 0 // + 4
-x = 4 // * -1
x = -4
x = -4
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