✅ Após resolver a equação do primeiro grau, concluímos que seu conjunto solução é:
[tex]\Large\displaystyle\text{$\begin{gathered}\boxed{\boxed{\:\:\:\bf S = \{6\}\:\:\:}}\end{gathered}$}[/tex]
Portanto, a opção correta é:
[tex]\Large\displaystyle\text{$\begin{gathered}\boxed{\boxed{\:\:\:\bf Letra\:C\:\:\:}}\end{gathered}$}[/tex]
Montando e resolvendo equação do primeiro grau:
[tex]\Large\displaystyle\text{$\begin{gathered}\tt 3x + \frac{x}{2} = 21 \end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered}\tt \frac{6x + x}{2} = 21\end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered}\tt 6x + x = 2\cdot21\end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered}\tt 7x = 42\end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered}\tt x = \frac{42}{7} \end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered}\tt x = 6\end{gathered}$}[/tex]
✅ Portanto, o conjunto solução é:
[tex]\Large\displaystyle\text{$\begin{gathered}\tt S = \{6\}\end{gathered}$}[/tex]
Saiba mais:
- https://brainly.com.br/tarefa/40495373
- https://brainly.com.br/tarefa/50555691
- https://brainly.com.br/tarefa/14927039
- https://brainly.com.br/tarefa/26734576
- https://brainly.com.br/tarefa/172920
- https://brainly.com.br/tarefa/22227342
- https://brainly.com.br/tarefa/32584305
- https://brainly.com.br/tarefa/6862414
- https://brainly.com.br/tarefa/47783248
- https://brainly.com.br/tarefa/6210820
- https://brainly.com.br/tarefa/39391387
- https://brainly.com.br/tarefa/45212895
