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