Question

3x-7=15

Answer 1

\[3x-\color{red}{7}=\color{blue}{15} \\
\underline{~~~~+\color{red}{7}~+\color{blue}{7}} \\
3x+\color{red}{0}=\color{blue}{22} \\
\:\\
\color{green}{\frac{1}{3}}\times3x=22\times\color{green}{\frac{1}{3}} \\
~~~~~~1x = \frac{22}{3} \\
~~~~~~~\color{purple}{\underline{\overline{\left \vert \color{black}{x = \frac{22}{3}}\right\vert}}}\]