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b in (-oo:+oo)
4*b-(5*b)+7/8 = -81/8 // + -81/8
4*b-(5*b)+7/8-(-81/8) = 0
4*b-5*b+7/8+81/8 = 0
11-b = 0 // - 11
-b = -11 // * -1
b = 11
b = 11
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