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b in (-oo:+oo)
5*b-8 = 6*b-6 // - 6*b-6
5*b-(6*b)-8+6 = 0
5*b-6*b-8+6 = 0
-b-2 = 0 // + 2
-b = 2 // * -1
b = -2
b = -2
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