3y ➖15 = y ➕ 1
We move all terms to the left:
3y ➖ 15 ➖ (y ➕ 1) = 0
We get rid of the parentheses.
3y ➖ y ➖ 1 ➖ 15 = 0
We add all the numbers and all the variables.
2y ➖ 16 = 0
We move all terms containing y to the left side, all other terms to the right side
2y = 16
y = 16/2
y = 8
