Раскрыть скобки и упростить выражение.
1. a-(b+a)=
2.-(m-n)-n=
3.с+(-c+d)=
4.(a+1,6)-(a+2,4)=
5.-(3,4-x)+(-x+1,6)=
6.-(x-2,7+y)-(6,5-x)=
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