Помогите пожалуйста
Раскройте скобки и упростите:
1) (x+y)-(y-z)-(z+2,9)=
2) (a+8)-(a+b)+(b-c)=
3) (7-m)+(m+n)-(n-k)=
4) (x-n)+(m-5)-(m-n)=
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