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X in (-oo:+oo)
7-((2*X)/4) = 3*X+5/9 // - 3*X+5/9
7-((2*X)/4)-(3*X)-(5/9) = 0
(-1/2)*X-3*X-5/9+7 = 0
58/9-7/2*X = 0 // - 58/9
-7/2*X = -58/9 // : -7/2
X = -58/9/(-7/2)
X = 116/63
X = 116/63
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