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b in (-oo:+oo)
47 = 5-7*b-(7*b) // - 5-7*b-(7*b)
7*b-(-7*b)-5+47 = 0
7*b+7*b-5+47 = 0
14*b+42 = 0 // - 42
14*b = -42 // : 14
b = -42/14
b = -3
b = -3
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