Answer:
Explanation:
7.
n=5 (given)
3n=15
3n-7=8
-10(3n-7)=-80
Check:
-10(3(5)-7)=-80
-10(15-7)=-80
-10(8)=-80
-80=-80
For 8 you can create your own descriptions of the next step (i.e Multiply both sides by 2) and just build a different equation from there.