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x in (-oo:+oo)
(x-3)/4 = x // - x
(x-3)/4-x = 0
(x-3)/4+(4*(-x))/4 = 0
x+4*(-x)-3 = 0
-3*x-3 = 0
(-3*x-3)/4 = 0
(-3*x-3)/4 = 0 // * 4
-3*x-3 = 0
-3*x-3 = 0 // + 3
-3*x = 3 // : -3
x = 3/(-3)
x = -1
x = -1
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