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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+87 = 0
(y+87)/6 = 0
(y+87)/6 = 0 // * 6
y+87 = 0
y+87 = 0 // - 87
y = -87
y = -87
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