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x in (-oo:+oo)
(2/3)*x+4/9 = (5/18)*x-(8/9) // - (5/18)*x-(8/9)
(2/3)*x-((5/18)*x)+4/9+8/9 = 0
(2/3)*x+(-5/18)*x+4/9+8/9 = 0
7/18*x+4/3 = 0 // - 4/3
7/18*x = -4/3 // : 7/18
x = -4/3/7/18
x = -24/7
x = -24/7
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