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