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