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a in (-oo:+oo)
a/25 = 9/45 // - 9/45
a/25-(9/45) = 0
a/25-1/5 = 0
1/25*a-1/5 = 0 // + 1/5
1/25*a = 1/5 // : 1/25
a = 1/5/1/25
a = 5
a = 5
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