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b in (-oo:+oo)
6*b-2 = 86-2*b // - 86-2*b
6*b-(-2*b)-86-2 = 0
6*b+2*b-86-2 = 0
8*b-88 = 0 // + 88
8*b = 88 // : 8
b = 88/8
b = 11
b = 11
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