The first expression is

since there is 7 in both parenthesis, we can factorize 7, then we can write

Second expression.
In this part, we have

by applying the distributive law, this expression is equivalent to

Third expression.
We have in this part:

similarly to the first question, we can factorize 6, then we obtain

Fourth expression.
We have in this part:

by applying the distributive law, this expression is equivalent to
