17у+13у-у+5у-(3х-а)+(4а-х)=34у-2х+3а
9х-7х+5х-2х=5х
8с-4k-9c+3k=-1c-1k
3a+2a-7a+2a=0
2n-(3k-4n)+(k-7n)=-9n-2k
12x-4x+2x-6x=4x
4x-15y-3x-20y=x-35y
17у+13у-у+5у-(3х-а)+(4а-х)=34у-2х+3а
9х-7х+5х-2х=5х
8с-4k-9c+3k=-1c-1k
3a+2a-7a+2a=0
2n-(3k-4n)+(k-7n)=-9n-2k
12x-4x+2x-6x=4x
4x-15y-3x-20y=x-35y