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x in (-oo:+oo)
4/2-(2*x)+4 = 1 // - 1
4/2-(2*x)-1+4 = 0
4/2-2*x-1+4 = 0
5-2*x = 0 // - 5
-2*x = -5 // : -2
x = -5/(-2)
x = 5/2
x = 5/2
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