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