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b in (-oo:+oo)
-2/5 = 6*b-(7*b)+3/5 // - 6*b-(7*b)+3/5
7*b-(6*b)-2/5-(3/5) = 0
7*b-6*b-2/5-3/5 = 0
b-1 = 0 // + 1
b = 1
b = 1
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