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