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