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b in (-oo:+oo)
(1/6)*b-(6/7) = 41/42 // - 41/42
(1/6)*b-(6/7)-(41/42) = 0
(1/6)*b-6/7-41/42 = 0
1/6*b-11/6 = 0 // + 11/6
1/6*b = 11/6 // : 1/6
b = 11/6/1/6
b = 11
b = 11
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