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a in (-oo:+oo)
2/5+9 = 2*a-(11/7) // - 2*a-(11/7)
2/5-(2*a)+11/7+9 = 0
2/5-2*a+11/7+9 = 0
384/35-2*a = 0 // - 384/35
-2*a = -384/35 // : -2
a = -384/35/(-2)
a = 192/35
a = 192/35
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