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b in (-oo:+oo)
5*b+8 = 6*b+4 // - 6*b+4
5*b-(6*b)-4+8 = 0
5*b-6*b-4+8 = 0
4-b = 0 // - 4
-b = -4 // * -1
b = 4
b = 4
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