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y in (-oo:+oo)
(-1/4)*y-1 = 13.5 // - 13.5
(-1/4)*y-13.5-1 = 0
-1/4*y-14.5 = 0 // + 14.5
-1/4*y = 14.5 // : -1/4
y = 14.5/(-1/4)
y = -58
y = -58
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