For this case we have the following problem given: |v-5|+7=21
And we want to solve for the value of v. On this case we just need to do the following procedure. First we can start subtracting 7 from both sides of the equation and we got:
Then since we have an absolute value we have two possible solutions:
First one:
Second one:
And then the solution for this case would be
v= -9 or v=19