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x in (-oo:+oo)
(2/3)*x-9 = (7/9)*x // - (7/9)*x
(2/3)*x-((7/9)*x)-9 = 0
(2/3)*x+(-7/9)*x-9 = 0
-1/9*x-9 = 0 // + 9
-1/9*x = 9 // : -1/9
x = 9/(-1/9)
x = -81
x = -81
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