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