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X in (-oo:+oo)
2 = (1/2)*X+1 // - (1/2)*X+1
2-((1/2)*X)-1 = 0
(-1/2)*X-1+2 = 0
1-1/2*X = 0 // - 1
-1/2*X = -1 // : -1/2
X = -1/(-1/2)
X = 2
X = 2
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