Hi
7|9n+10|=70
First divide both sides by 7
7(|9n+10|)/7= 70/7
|9n+10|=10
Now we need to find the absolute value
|9n+10=10
We know that either 9n+10=10 or 9n=10=-10
We have to possibility
The first possibility is
9n+10=10
Now we need to subtract 10 to both sides so we can find the value for n for the possibility 1
9n+10-10=10-10
9n=0
Now divide both sides by 9 so we can find the value for N
9n/9=0/9
n= 0
Now let's go for possibility 2
9n+10=-10
We gonna do the same thing for possibility 2 by subtract 10 from both sides
9n+10-10=10-10
9n=-20
Divide both sides by 9 so we can find the value for N
9n/9=-20/9
n= -20/9
Answer ; N=0 or N=-20/9
I hope that's help and good luck :)