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