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