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y in (-oo:+oo)
(1/4)*y-((1/2)*y) = 4 // - 4
(1/4)*y-((1/2)*y)-4 = 0
(1/4)*y+(-1/2)*y-4 = 0
-1/4*y-4 = 0 // + 4
-1/4*y = 4 // : -1/4
y = 4/(-1/4)
y = -16
y = -16
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