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x in (-oo:+oo)
(4/9)*x-1 = (5/6)*x // - (5/6)*x
(4/9)*x-((5/6)*x)-1 = 0
(4/9)*x+(-5/6)*x-1 = 0
-7/18*x-1 = 0 // + 1
-7/18*x = 1 // : -7/18
x = 1/(-7/18)
x = -18/7
x = -18/7
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