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