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