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