Ferdinand Porsche

I am working full time on my math, I have after some time realized that engineering is what I want to do. Therefore I need to do great things to my math and physics skills! As of today I work to go from complete noob to pro... Sometimes I just can't manage to understand a simple task Todays question is how come 6-(-5)x2+(-3)x5 is 1? (sorry, I just don't get this one. I end up at negative numbers or numbers which is larger than the number one)