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a in (-oo:+oo)
1/3-a = 5/3 // - 5/3
1/3-a-(5/3) = 0
1/3-a-5/3 = 0
-a-4/3 = 0 // + 4/3
-a = 4/3 // * -1
a = -4/3
a = -4/3
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