Can someone please help me I’m very confused. How do you solve 18z+2xsquared-14x-8x squared+5x and one more question if your going to do 1/2(18v-10x)-20x how would you go about solving this?

Iwill give brainliest. suppose tommy walks from his home at (0, 0) to the mall at (0, 5), and then walks to a movie theater at (6, 5). after leaving the theater tommy walks to the store at (6, 0) before returning home. if each grid square represents one block, how many blocks does he walk?