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x in (-oo:+oo)
9*(2-((4/9)*x)) = 0
9*((-4/9)*x+2) = 0
9*(2-4/9*x) = 0
2-4/9*x = 0 // - 2
-4/9*x = -2 // : -4/9
x = -2/(-4/9)
x = 9/2
x = 9/2
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