Question

21 = 3x ????????????????????????????

Answer 1

$\Large\displaystyle\begin{gathered} \sf{21=3x } \end{gathered}$

$\Large\displaystyle\begin{gathered} \sf{3x=21 } \end{gathered}$

$\Large\displaystyle\text{ \begin{gathered} \sf{x=\frac{21}{3} } \end{gathered} }$

$\Large\displaystyle\begin{gathered} \sf{ x=7\checkmark} \end{gathered}$