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a in (-oo:+oo)
3*a = 2/3 // - 2/3
3*a-(2/3) = 0
3*a-2/3 = 0
3*a-2/3 = 0 // + 2/3
3*a = 2/3 // : 3
a = 2/3/3
a = 2/9
a = 2/9
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