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y in (-oo:+oo)
12 = (-1/4)*y // - (-1/4)*y
12-((-1/4)*y) = 0
(1/4)*y+12 = 0
1/4*y+12 = 0 // - 12
1/4*y = -12 // : 1/4
y = -12/1/4
y = -48
y = -48
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