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a in (-oo:+oo)
(2*a)/3+8/9 = 4 // - 4
(2*a)/3+8/9-4 = 0
2/3*a-28/9 = 0 // + 28/9
2/3*a = 28/9 // : 2/3
a = 28/9/2/3
a = 14/3
a = 14/3
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