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y in (-oo:+oo)
(y-3)/(-6) = -15 // + 15
(y-3)/(-6)+15 = 0
(y-3)/(-6)+(-6*15)/(-6) = 0
y-6*15-3 = 0
y-93 = 0
(y-93)/(-6) = 0
(y-93)/(-6) = 0 // * -6
y-93 = 0
y-93 = 0 // + 93
y = 93
y = 93
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