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y in (-oo:+oo)
(-1/4)*y-1 = 11 // - 11
(-1/4)*y-11-1 = 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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