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