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x in (-oo:+oo)
1/6-((1/3)*x) = 2/3 // - 2/3
1/6-((1/3)*x)-(2/3) = 0
(-1/3)*x+1/6-2/3 = 0
-1/3*x-1/2 = 0 // + 1/2
-1/3*x = 1/2 // : -1/3
x = 1/2/(-1/3)
x = -3/2
x = -3/2
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