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