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y in (-oo:+oo)
(-1/4)*y-1 = 12.75 // - 12.75
(-1/4)*y-12.75-1 = 0
-1/4*y-13.75 = 0 // + 13.75
-1/4*y = 13.75 // : -1/4
y = 13.75/(-1/4)
y = -55
y = -55
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