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b in (-oo:+oo)
5*b+2/5 = -(7*b)-718/5 // + -(7*b)-718/5
5*b+7*b+2/5-(-718/5) = 0
5*b+7*b+2/5+718/5 = 0
12*b+144 = 0 // - 144
12*b = -144 // : 12
b = -144/12
b = -12
b = -12
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