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b in (-oo:+oo)
(b+9)/(-3) = -15 // + 15
(b+9)/(-3)+15 = 0
(b+9)/(-3)+(-3*15)/(-3) = 0
b-3*15+9 = 0
b-36 = 0
(b-36)/(-3) = 0
(b-36)/(-3) = 0 // * -3
b-36 = 0
b-36 = 0 // + 36
b = 36
b = 36
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