120 + 170 + 78 = x
Is the above equation correct? Please answer Yes or No with reasons (at least three good and very specific reasons which can be seen clearly once you understand).*
Well actually they can be seen clearly even if you don't understand! Hints will follow at some point if necessary.
The three reasons all apply to the same answer. There aren't three reasons and three different answers.
The necessary clues are there. If you don't get the 3 clues you won't get the complete answer.