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a in (-oo:+oo)
12/5 = a/9 // - a/9
12/5-(a/9) = 0
12/5-1/9*a = 0 // - 12/5
-1/9*a = -12/5 // : -1/9
a = -12/5/(-1/9)
a = 108/5
a = 108/5
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