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b in (-oo:+oo)
6/10 = b/7 // - b/7
6/10-(b/7) = 0
3/5-1/7*b = 0 // - 3/5
-1/7*b = -3/5 // : -1/7
b = -3/5/(-1/7)
b = 21/5
b = 21/5
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