Question

(x+y-z)-1 x+(y-x) (x+y)-(x-y) (x-y+z)-x+y-z) (a+b-c)+2 a+(b-c) a-(a-b+c) (a-b+1)-(a+b-1) (m+p-q)-p m+(p-m) m-(m-p+q) (p+q)-(p-q) (m-p+5)-(m+p-5)