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a in (-oo:+oo)
(4/3)*a+5/9 = 13/9 // - 13/9
(4/3)*a+5/9-(13/9) = 0
(4/3)*a+5/9-13/9 = 0
4/3*a-8/9 = 0 // + 8/9
4/3*a = 8/9 // : 4/3
a = 8/9/4/3
a = 2/3
a = 2/3
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