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a in (-oo:+oo)
(1/3)*a-(4/9) = 7/9-((5/6)*a) // - 7/9-((5/6)*a)
(1/3)*a+(5/6)*a-(4/9)-(7/9) = 0
(1/3)*a+(5/6)*a-4/9-7/9 = 0
7/6*a-11/9 = 0 // + 11/9
7/6*a = 11/9 // : 7/6
a = 11/9/7/6
a = 22/21
a = 22/21
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