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x in (-oo:+oo)
(2/3)*x-6 = (5/6)*x // - (5/6)*x
(2/3)*x-((5/6)*x)-6 = 0
(2/3)*x+(-5/6)*x-6 = 0
-1/6*x-6 = 0 // + 6
-1/6*x = 6 // : -1/6
x = 6/(-1/6)
x = -36
x = -36
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