Angela's age right now is exactly 3 times her age 3 years from now, minus 3 times her age 3 years ago. How old is Angela right now?
Solution
Let stand for Angela's age. Then her age 3 years from now will be a + 3, and her age 3 years ago is .
So: .
Check: If Angela is 18, then in 3 years she'll be 21, and 3 years ago she was 15.
So, does 18 equal ? Yep.