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