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x in (-oo:+oo)
(x-3)/4 = x/2 // - x/2
(x-3)/4-(x/2) = 0
(x-3)/4-x/2 = 0
(2*(x-3))/(2*4)+(4*(-x))/(2*4) = 0
2*(x-3)+4*(-x) = 0
-2*x-6 = 0
(-2*x-6)/(2*4) = 0
(-2*x-6)/(2*4) = 0 // * 2*4
-2*x-6 = 0
-2*x-6 = 0 // + 6
-2*x = 6 // : -2
x = 6/(-2)
x = -3
x = -3
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