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a in (-oo:+oo)
11/30 = a/9 // - a/9
11/30-(a/9) = 0
11/30-1/9*a = 0 // - 11/30
-1/9*a = -11/30 // : -1/9
a = -11/30/(-1/9)
a = 33/10
a = 33/10
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