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