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