(3y + 5) is dividing on the left, then it will multiply on the right
y is dividing on the right, then it will multiply on the left
Distributing:
9y is adding on the right, then it will subtract on the left
14y - 9y = 15
5y = 15
5 is multiplying on the left, then it will divide on the right
y = 15/5
y = 3