[tex]20 \: \: \vdots \: \: x + 2 = > x + 2 \: \in \: D_{20}[/tex]
[tex]D_{20}=\left\{\pm1,\pm2,\pm4,\pm5,\pm10,\pm20\right\}[/tex]
[tex]1)x + 2 = - 1 = > x = - 3[/tex]
[tex]2)x + 2 = 1 = > x = - 1[/tex]
[tex]3)x + 2 = - 2 = > x = - 4[/tex]
[tex]4)x + 2 = 2 = > x = 0[/tex]
[tex]5)x + 2 = - 4 = > x = - 6[/tex]
[tex]6)x + 2 = 4 = > x = 2[/tex]
[tex]7)x + 2 = - 5 = > x = - 7[/tex]
[tex]8)x + 2 = 5 = > x = 3[/tex]
[tex]9)x + 2 = - 10 = > x = - 12[/tex]
[tex]10)x + 2 = 10 = > x = 8[/tex]
[tex]11)x + 2 = - 20 = > x = - 22[/tex]
[tex]12)x + 2 = 20 = > x = 18[/tex]
