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x in (-oo:+oo)
-3*x-(2/3) = -1/3 // + -1/3
-3*x-(2/3)-(-1/3) = 0
1/3-3*x-2/3 = 0
-3*x-1/3 = 0 // + 1/3
-3*x = 1/3 // : -3
x = 1/3/(-3)
x = -1/9
x = -1/9
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