Question

Calcule o valor desconhecido 15=2×+3

Answer 1

Após resolver a equação do primeiro grau, concluimos que o valor desconhecido é:

          $\Large\displaystyle\text{ \begin{gathered}\boxed{\boxed{\:\:\:\bf x = 6\:\:\:}}\end{gathered} }$

Resolvendo equação do primeiro grau:

         $\Large\displaystyle\begin{gathered}\tt 15 = 2x + 3\end{gathered}$

    $\Large\displaystyle\begin{gathered}\tt -2x = 3 - 15\end{gathered}$

    $\Large\displaystyle\begin{gathered}\tt -2x = -12\end{gathered}$

         $\Large\displaystyle\begin{gathered}\tt 2x = 12\end{gathered}$

            $\Large\displaystyle\begin{gathered}\tt x = \frac{12}{2}\end{gathered}$

            $\Large\displaystyle\begin{gathered}\tt x = 6\end{gathered}$

Portanto, o resultado é:

             $\Large\displaystyle\begin{gathered}\tt x = 6\end{gathered}$

$\LARGE\displaystyle\text{ \begin{gathered} \underline{\boxed{\boldsymbol{\:\:\:Bons \:estudos!!\:\:\:Boa\: sorte!!\:\:\:}}}\end{gathered} }$

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Answer 2

$\sf15=2x+3$

$\sf-2x=3-15$

$\sf-2x=-12$

$\boxed{\boxed{\sf x=6}}$