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b in (-oo:+oo)
3*(-2*b-3) = -9 // + 9
3*(-2*b-3)+9 = 0
3*(-2*b-3)+9 = 0
-6*b = 0
-6*b = 0
-6*b = 0 // : -6
b = 0
b = 0
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