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b in (-oo:+oo)
6*b+3 = 3*b-33 // - 3*b-33
6*b-(3*b)+3+33 = 0
6*b-3*b+3+33 = 0
3*b+36 = 0 // - 36
3*b = -36 // : 3
b = -36/3
b = -12
b = -12
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