The hanger to the left is balanced. If each triangle weighs 2 pounds and each and each circle weighs three times that amount, which of the following equations could not be used to find the weight of a square?
1) 2x + 3x + 3x = 10
2) 2x + 3(2x) + 3(2x) = 10
3) 2x + 3(2x) + 3(2x) = 14
4) 2x + 3(2x) + 3(2x) = 18
