When adding 3 and -9, how do you know that the sun is negative?

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

What is a possible solutions of the x> 3?