Упростите выражение:
а) (х+у)+(у-х)=
б) (а-b)-(a-b)=
в) (c-d)-(c+d)=
г) (и+u)-(u-и)=
д) m-(n-p-m)=
е) (a+b)-(b+c)-(a-c)=
ж) (k+m)-(k-m)+(m-k)=
з) (b+1)-(a-1)-(b-a)
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