Explanation
Step 1
[tex]\begin{gathered} 5x+3x \\ \text{combine like terms} \\ 8x \end{gathered}[/tex]
or
[tex]\begin{gathered} 5x+3x \\ \text{factorize x} \\ (5+3)x \\ 8x \end{gathered}[/tex]Step 2
[tex]\begin{gathered} 5x-3x \\ \text{add similar terms} \\ 5x-3x=2x \end{gathered}[/tex]or
[tex]\begin{gathered} 5x-3x \\ \text{factorize x} \\ (5-3)x \\ 2x \end{gathered}[/tex]I hope this helps you