Из данных равенств выберите тождество:
1) 4y-8 =4(y-2);
2) х+(х-4)=3х-4;
3) a-b+c=-(b-a-c);
4) 9a-(b+c)=9a-b-c;
5) 2y-6=2(y-1);
6) 2,5x+1,7x-3,2x=x.


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