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