Solution:
Definition of like terms:
In algebra, like terms are terms that have the same variables and powers. The coefficients do not need to match. Unlike terms are two or more terms that are not like terms, i.e. they do not have the same variables or powers. The order of the variables does not matter unless there is a power
Therefore,
with the illustration above,
The final answer
[tex]20x,0.8x[/tex]