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b in (-oo:+oo)
(7/9)*b = 31/9 // - 31/9
(7/9)*b-(31/9) = 0
(7/9)*b-31/9 = 0
7/9*b-31/9 = 0 // + 31/9
7/9*b = 31/9 // : 7/9
b = 31/9/7/9
b = 31/7
b = 31/7
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