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b in (-oo:+oo)
(6/7)*b+5 = 40/7 // - 40/7
(6/7)*b-(40/7)+5 = 0
(6/7)*b-40/7+5 = 0
6/7*b-5/7 = 0 // + 5/7
6/7*b = 5/7 // : 6/7
b = 5/7/6/7
b = 5/6
b = 5/6
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