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y in (-oo:+oo)
(-1/4)*y-1 = -16 // + 16
(-1/4)*y-1+16 = 0
15-1/4*y = 0 // - 15
-1/4*y = -15 // : -1/4
y = -15/(-1/4)
y = 60
y = 60
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