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[tex]\\ \sf\longmapsto -12\leqslant x\leqslant -2[/tex]
[tex]\\ \sf\longmapsto -2\leqslant x\leqslant 2[/tex]
[tex]\\ \sf\longmapsto 2\leqslant x\leqslant 12[/tex]
Combine all
[tex]\\ \sf\longmapsto -12\leqslant x\leqslant 12[/tex]
Graph all