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b in (-oo:+oo)
1480/63 = (4/7)*b+7*b+7/9 // - (4/7)*b+7*b+7/9
1480/63-((4/7)*b)-(7*b)-(7/9) = 0
(-4/7)*b-7*b+1480/63-7/9 = 0
159/7-53/7*b = 0 // - 159/7
-53/7*b = -159/7 // : -53/7
b = -159/7/(-53/7)
b = 3
b = 3
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