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