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b in (-oo:+oo)
6*b-10 = 7*b-19 // - 7*b-19
6*b-(7*b)-10+19 = 0
6*b-7*b-10+19 = 0
9-b = 0 // - 9
-b = -9 // * -1
b = 9
b = 9
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