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x in (-oo:+oo)
1-(2*x) = x-(2/2)+4 // - x-(2/2)+4
2/2-(2*x)-x-4+1 = 0
2/2-2*x-x-4+1 = 0
-3*x-2 = 0 // + 2
-3*x = 2 // : -3
x = 2/(-3)
x = -2/3
x = -2/3
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