Упростите.
(x+y)+(y+x)
(a-b)-(a-b)
(c-d)-(c+d)
(u+v)-(u-v)
m-(n-p-m)
(a+b)-(b+c)-(a-c)
(k+m)-(k-m)+(m-k)
(b+1)-(a-1)-(b-a)
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