1. m-(3,5+m)=m-3,5-m=-3,5
2. 2,9-(x-6,7)=2,9-x+6,7=9,6-x
3. 9-(8/2/3-х)=
4. с-(а+с)=с-а-с=-а
5. (m+n)-(n-m)=m+n-n+m=2m
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Answers & Comments
1. m-(3,5+m)=m-3,5-m=-3,5
2. 2,9-(x-6,7)=2,9-x+6,7=9,6-x
3. 9-(8/2/3-х)=
4. с-(а+с)=с-а-с=-а
5. (m+n)-(n-m)=m+n-n+m=2m