Question

O+... = 00 +...=80+...=0O+... = 30 +... = 10+...=0

Answer 1

0 + 0 = 00 + 80 = 80 + (-80) = 0

0 + 30 = 30 + (-20) = 10 + (-10) = 0

Answer 2

It seems like you're trying to express a series of equations using a combination of letters and numbers. However, the notation you've provided is not standard mathematical notation, so it's a bit unclear what you're trying to convey.

If you could provide more context or clarify your question, I'd be happy to help you understand or solve the equations you're working with.