Write these two terms as a sum, then write in standard form: 4b and the opposite of 4b+ 20

We have
4b
And the opposite of "4b + 20" is:
[tex]\begin{gathered} -(4b+20) \\ -4b-20 \end{gathered}[/tex]We can write the sum of these 2 expressions as:
[tex]\begin{gathered} (4b)+(-4b-20) \\ =4b-4b-20 \\ =-20 \end{gathered}[/tex]