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