`2|x|-|x+2|=2`
`@TH1: x < -2=>{(|x| = -x),(|x+2|=-x-2):}`
`=>-2x-(-x-2)=2`
`<=>-2x+x+2=2`
`<=>x=0` (ko t/m)
`@TH2: -2 <= x < 0=>{(|x|=-x),(|x+2|=x+2):}`
`=>-2x-(x+2)=2`
`<=>-3x-2=2`
`<=>x=-4/3` (t/m)
`@TH3: x >= 0=>{(|x|=x),(|x+2|=x+2):}`
`=>2x-(x+2)=2`
`<=>2x-x-2=2`
`<=>x=4` (t/m)
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