(8x+5y-3z)-(-5x+3y+5z)
(9x+6y+10z)-(5x-4y+3z)
(20x-30y+25z)-(10x-15y+5z)
(4x+3y-8z)-(7x-8y+5z)
(10x+11y-10z)-(-8x+6y+5z)
10x-15y+20z
4x+10y+7z
18x+5y-15z
-3x+11y-13z
13x+2y-8z
