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x in (-oo:+oo)
(13/9)*x = (7/3)*x-(4/9) // - (7/3)*x-(4/9)
(13/9)*x-((7/3)*x)+4/9 = 0
(13/9)*x+(-7/3)*x+4/9 = 0
4/9-8/9*x = 0 // - 4/9
-8/9*x = -4/9 // : -8/9
x = -4/9/(-8/9)
x = 1/2
x = 1/2
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