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b in (-oo:+oo)
4*b+8 = 5*b+7 // - 5*b+7
4*b-(5*b)-7+8 = 0
4*b-5*b-7+8 = 0
1-b = 0 // - 1
-b = -1 // * -1
b = 1
b = 1
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