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a in (-oo:+oo)
9/15 = a/5 // - a/5
9/15-(a/5) = 0
3/5-1/5*a = 0 // - 3/5
-1/5*a = -3/5 // : -1/5
a = -3/5/(-1/5)
a = 3
a = 3
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