Resposta :
Olá!
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[tex] \\ { \large \displaystyle \sf {2x + 1 < 7}}[/tex]
[tex]{ \large \displaystyle \sf {2x < 7 - 1}}[/tex]
[tex]{ \large \displaystyle \sf {2x < 6}} \\ [/tex]
[tex]{ \large \displaystyle \sf {x < \frac{6}{2} }} \\ [/tex]
[tex] \boxed{ \boxed{ \pink{{ \large \displaystyle \sf {x < 3 }}}}} \\ [/tex]