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x in (-oo:+oo)
(2/3)*x-9 = (5/6)*x // - (5/6)*x
(2/3)*x-((5/6)*x)-9 = 0
(2/3)*x+(-5/6)*x-9 = 0
-1/6*x-9 = 0 // + 9
-1/6*x = 9 // : -1/6
x = 9/(-1/6)
x = -54
x = -54
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