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x in (-oo:+oo)
(1/3)*x-6 = (4/9)*x // - (4/9)*x
(1/3)*x-((4/9)*x)-6 = 0
(1/3)*x+(-4/9)*x-6 = 0
-1/9*x-6 = 0 // + 6
-1/9*x = 6 // : -1/9
x = 6/(-1/9)
x = -54
x = -54
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