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a in (-oo:+oo)
(31/9)*a = 3/7 // - 3/7
(31/9)*a-(3/7) = 0
(31/9)*a-3/7 = 0
31/9*a-3/7 = 0 // + 3/7
31/9*a = 3/7 // : 31/9
a = 3/7/31/9
a = 27/217
a = 27/217
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