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b in (-oo:+oo)
-b-6 = -4*b-18 // + -4*b-18
18-b-(-4*b)-6 = 0
4*b-b-6+18 = 0
3*b+12 = 0 // - 12
3*b = -12 // : 3
b = -12/3
b = -4
b = -4
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