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b in (-oo:+oo)
3*b+8 = -6*b-100 // + -6*b-100
3*b-(-6*b)+8+100 = 0
3*b+6*b+8+100 = 0
9*b+108 = 0 // - 108
9*b = -108 // : 9
b = -108/9
b = -12
b = -12
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