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