Hafıza Sarayım…

\begin{alignat}{2} 2x&-3&={}&7\\ &\color{red}{{}+3}&\color{red}{{}+{}}&\color{red}{3}\\ \color{blue}{\frac{\color{black}{2x}}{2}}&&={}&\color{blue}{\frac{\color{black}{10}}{2}}\\ x&&={}&\phantom{0}5 \end{alignat}