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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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