500
You decide to see if you can ride the elevator to street level (floor 0) without pushing any buttons. The elevator takes you up 4 floors, down 6 floors, up 1 floor, down 8 floors, down 3 floors, up 1 floor, and then down 6 floors to street level. Write and solve an equation to find your starting floor.
What is x + 4 - 6 +1 - 8 - 3 +1 -6 = 0; 17