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b in (-oo:+oo)
6*b+3 = 7*b+13 // - 7*b+13
6*b-(7*b)-13+3 = 0
6*b-7*b-13+3 = 0
-b-10 = 0 // + 10
-b = 10 // * -1
b = -10
b = -10
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