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b in (-oo:+oo)
b+(2/7)*b+4 = 47/14 // - 47/14
b+(2/7)*b-(47/14)+4 = 0
b+(2/7)*b-47/14+4 = 0
9/7*b+9/14 = 0 // - 9/14
9/7*b = -9/14 // : 9/7
b = -9/14/9/7
b = -1/2
b = -1/2
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