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b in (-oo:+oo)
(6/7)*b = 48/7 // - 48/7
(6/7)*b-(48/7) = 0
(6/7)*b-48/7 = 0
6/7*b-48/7 = 0 // + 48/7
6/7*b = 48/7 // : 6/7
b = 48/7/6/7
b = 8
b = 8
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