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-((1/3)*x)-1/6 = 2/3 // - 2/3
-((1/3)*x)-1/6-(2/3) = 0
(-1/3)*x-1/6-2/3 = 0
-1/3*x-5/6 = 0 // + 5/6
-1/3*x = 5/6 // : -1/3
x = 5/6/(-1/3)
x = -5/2
x = -5/2
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