Respuesta:
[tex]\:f\left(x\right)=|x+3|\:[/tex]
[tex]0\:=\:\left|x+3\right|[/tex]
[tex]\left|x+3\right|\:=\:0[/tex]
[tex]x\:+3\:=\:0[/tex]
x + 3 = 0
x = -3 RPTA