What you must do for this case is to follow the following steps.
1) Rewrite the expression completely.
2) make a double c.
3) Factor each quadratic expression correctly.
4) cancel similar terms.
Answer: 2n See attached images.
Take a pic of whole page so I can see instructions
Do a gallon man 1G 4Q 2P 2C
If one third of t is 7 than t is equal to 21