Question

If 3y + 3 = y + 7 is the same as y + y +y + 1 + 1 + 1 = y + 1 + 1 + 1 + 1+ 1 + 1 + 1, then how can we isolate 'y' without disrupting the balance?

Answer 1

Answer: The expanded form isn't required. Just make sure that it's possible to send the variable you are solving for to one side, and then solve.

Explanation:

combine like terms:

3y-y = 7-3

2y = 4

y = 2