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a in (-oo:+oo)
5*a = 13/25 // - 13/25
5*a-(13/25) = 0
5*a-13/25 = 0
5*a-13/25 = 0 // + 13/25
5*a = 13/25 // : 5
a = 13/25/5
a = 13/125
a = 13/125
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