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