For absolute value, remember that the simplified version of the absolute value of a number will always be positive, because absolute value means the distance from 0. So that being said, the absolute value of |-78| is 78, because -78 is 78 places away from 0.
Once you know this, the rest is easy. Simplify all the absolute values, then solve normally. There will always be 2 answers, one positive one and one negative one. Make sure you list both on the test.
I hope this helped!