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x in (-oo:+oo)
(1/3)*x-4 = (4/9)*x // - (4/9)*x
(1/3)*x-((4/9)*x)-4 = 0
(1/3)*x+(-4/9)*x-4 = 0
-1/9*x-4 = 0 // + 4
-1/9*x = 4 // : -1/9
x = 4/(-1/9)
x = -36
x = -36
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