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a in (-oo:+oo)
(2/3)*a = 4/9 // - 4/9
(2/3)*a-(4/9) = 0
(2/3)*a-4/9 = 0
2/3*a-4/9 = 0 // + 4/9
2/3*a = 4/9 // : 2/3
a = 4/9/2/3
a = 2/3
a = 2/3
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