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