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