The first thing we will do in this case is define variables:
x = Tim'S age
We have then:
"Tim's age in 7 years will be three times what it was 19 years ago"
x + 7 = 3 * (x-19)
rewriting the equation:
x + 7 = 3x-57
Answer:
An equation for the given sentence is:
x + 7 = 3x-57