Olá!
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[tex]{ \large \displaystyle \sf {12x - 2x = 30}}[/tex]
[tex]{ \large \displaystyle \sf {10x = 30}} \\ [/tex]
[tex]{ \large \displaystyle \sf {x = \frac{30}{10} }} \\ [/tex]
[tex]{ \large \displaystyle \sf {x = 3}}[/tex]
[tex] \boxed{ \boxed{ \purple{{ \large \displaystyle \sf {S = \left \{ 3 \right \}}}}}} \\ \\ [/tex]
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Espero ter ajudado! ❤️
