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a in (-oo:+oo)
6/9 = a/5 // - a/5
6/9-(a/5) = 0
2/3-1/5*a = 0 // - 2/3
-1/5*a = -2/3 // : -1/5
a = -2/3/(-1/5)
a = 10/3
a = 10/3
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