[tex]A=\left \{ -3,2,\frac{1}{3} ,-7,20,-105,0,12,-1\right \}[/tex]
[tex]B=\left \{x \:|x\:\in\:A,x\:\in\mathbb{Z_{+}}\right \}[/tex]
[tex] = > B=\left \{2,20,12 \right \}[/tex]
[tex]C=\left \{x \:|x\:\in\:A,x> 0\right \}[/tex]
[tex] = > C=\left \{\frac{1}{3},2,12,20\right \}[/tex]
[tex]D=\left \{x\:|x\:\in\:A,x\:\in\:\mathbb{Z_{ - }}\right \}[/tex]
[tex] = > D=\left \{-105,-7,-3, -1 \right \}[/tex]