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b in (-oo:+oo)
4*b-(5*b)+6 = 7 // - 7
4*b-(5*b)-7+6 = 0
4*b-5*b-7+6 = 0
-b-1 = 0 // + 1
-b = 1 // * -1
b = -1
b = -1
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