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b in (-oo:+oo)
7*b-(2/3) = 6*b-(7/5) // - 6*b-(7/5)
7*b-(6*b)-(2/3)+7/5 = 0
7*b-6*b-2/3+7/5 = 0
b+11/15 = 0 // - 11/15
b = -11/15
b = -11/15
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