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x in (-oo:+oo)
-2*x-1 = -4/3 // + -4/3
-2*x-(-4/3)-1 = 0
4/3-2*x-1 = 0
1/3-2*x = 0 // - 1/3
-2*x = -1/3 // : -2
x = -1/3/(-2)
x = 1/6
x = 1/6
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