taco
|x+1|\(\ge\)0
|x+2|\(\ge\)0
|x+3|\(\ge\)0
\(\Rightarrow\)4x\(\ge\)0
\(\Rightarrow\)x\(\ge\)0
tu do ta co x+1+x+2+x+3=4x
3x+6=4x
4x-3x=6
x=6
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