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a in (-oo:+oo)
1/9 = a+4/5 // - a+4/5
1/9-a-(4/5) = 0
1/9-a-4/5 = 0
-a-31/45 = 0 // + 31/45
-a = 31/45 // * -1
a = -31/45
a = -31/45
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