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b in (-oo:+oo)
(5/7)*b+1/7 = 7*b+1/7 // - 7*b+1/7
(5/7)*b-(7*b)+1/7-(1/7) = 0
(5/7)*b-7*b+1/7-1/7 = 0
-44/7*b = 0 // : -44/7
b = 0
b = 0
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