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2x(1/6+x)-(2-x)-(x+2) (x-2) =
1/3x + 2x^2 -2 + x -(x^2 -4) =
1/3x + 2x^2 -2 +x -x^2 +4 =
1 1/3x + x^2 +2 =
-2/3 + 2 + 1/4 = 7/12