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x in (-oo:+oo)
-x-2/3 = -7/6 // + -7/6
-x-2/3-(-7/6) = 0
7/6-x-2/3 = 0
1/2-x = 0 // - 1/2
-x = -1/2 // * -1
x = 1/2
x = 1/2
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