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b in (-oo:+oo)
(6/7)*b-(4/5) = -388/35 // + -388/35
(6/7)*b-(4/5)-(-388/35) = 0
(6/7)*b-4/5+388/35 = 0
6/7*b+72/7 = 0 // - 72/7
6/7*b = -72/7 // : 6/7
b = -72/7/6/7
b = -12
b = -12
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