Из данных равенств выбери тождество:


1) 4y-8=4(y-2) 
2) x+(3x-4)=3x-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-3.2=x
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