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