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