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b in (-oo:+oo)
7*b+2/7 = 410/63 // - 410/63
7*b+2/7-(410/63) = 0
7*b+2/7-410/63 = 0
7*b-56/9 = 0 // + 56/9
7*b = 56/9 // : 7
b = 56/9/7
b = 8/9
b = 8/9
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