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a in (-oo:+oo)
(1/2)*a = 2/9 // - 2/9
(1/2)*a-(2/9) = 0
(1/2)*a-2/9 = 0
1/2*a-2/9 = 0 // + 2/9
1/2*a = 2/9 // : 1/2
a = 2/9/1/2
a = 4/9
a = 4/9
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