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b in (-oo:+oo)
8-2*b = 62/7 // - 62/7
8-2*b-(62/7) = 0
8-2*b-62/7 = 0
-2*b-6/7 = 0 // + 6/7
-2*b = 6/7 // : -2
b = 6/7/(-2)
b = -3/7
b = -3/7
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