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X in (-oo:+oo)
(4/3)*X-((5/9)*X) = 4 // - 4
(4/3)*X-((5/9)*X)-4 = 0
(4/3)*X+(-5/9)*X-4 = 0
7/9*X-4 = 0 // + 4
7/9*X = 4 // : 7/9
X = 4/7/9
X = 36/7
X = 36/7
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