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