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y in (-oo:+oo)
y/(-4) = 1/8 // - 1/8
y/(-4)-(1/8) = 0
y/(-4)-1/8 = 0
-1/4*y-1/8 = 0 // + 1/8
-1/4*y = 1/8 // : -1/4
y = 1/8/(-1/4)
y = -1/2
y = -1/2
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