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a in (-oo:+oo)
21/27 = a/18 // - a/18
21/27-(a/18) = 0
7/9-1/18*a = 0 // - 7/9
-1/18*a = -7/9 // : -1/18
a = -7/9/(-1/18)
a = 14
a = 14
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