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x in (-oo:+oo)
1/2-((2/3)*x) = 2/9 // - 2/9
1/2-((2/3)*x)-(2/9) = 0
(-2/3)*x+1/2-2/9 = 0
5/18-2/3*x = 0 // - 5/18
-2/3*x = -5/18 // : -2/3
x = -5/18/(-2/3)
x = 5/12
x = 5/12
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