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a in (-oo:+oo)
38/45 = a+4/9 // - a+4/9
38/45-a-(4/9) = 0
38/45-a-4/9 = 0
2/5-a = 0 // - 2/5
-a = -2/5 // * -1
a = 2/5
a = 2/5
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