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a in (-oo:+oo)
(5/7)*a+2/9 = 149/63 // - 149/63
(5/7)*a+2/9-(149/63) = 0
(5/7)*a+2/9-149/63 = 0
5/7*a-15/7 = 0 // + 15/7
5/7*a = 15/7 // : 5/7
a = 15/7/5/7
a = 3
a = 3
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