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