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a in (-oo:+oo)
a-a+1/3-(1/5) = 8/15 // - 8/15
a-a+1/3-(1/5)-(8/15) = 0
a-a+1/3-1/5-8/15 = 0
-2/5 = 0
a belongs to the empty set
a belongs to the empty set
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