Eta: I maintain that the answer is 2.
There's only one line with an equation.
Rules:
1) The first two lines cannot simply be omitted, you need to find a way to use them all.
2) Consider a 3 line display that only allows 9 characters to be printed on each line.
Hint: There are no spaces in between any of the numbers or operators since white space is ignored in a math problem. The spaces between the numbers and operators are only there to improve readability.