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.