Multiplication can be done in any order so move the 2 to the beginning of the parenthesis so you can get 2 (6n + 7). Then use the Distributive Property.
2 * 6n + 2 * 7. Simplify to 12n +14.
Step-by-step explanation:
2x+15=4x+9
2x=6
x=3
***
16 - 2t = t + 9 + 4t
16 - 2t = 5t + 9
-7t = -7
t = 1
Hope this helps! ;)