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y in (-oo:+oo)
(-1/4)*y-1 = 3.5 // - 3.5
(-1/4)*y-3.5-1 = 0
-1/4*y-4.5 = 0 // + 4.5
-1/4*y = 4.5 // : -1/4
y = 4.5/(-1/4)
y = -18
y = -18
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