a5
a-5
5a
(-5a)
5x
5x2
x
5x4/3
2y2- 5x + 12x2
2y2+ 5x -12x2
2y2 - 5x -12x2
(-2y2-5x + 12x2)
9x - y + 8z
x - 9y + 8z
x + 9y + 8z
9x + y - 8z
8xy
16xy
3xy
(-3xy)