Упростите выражения:
а)5+(3a-5b+7c)-(7c-5b+3a)=
б)7-(3x-4y+1)-(4y-3x+1)=
в)4x-(2x-7y+6)+(11-2x-7y)=
г)3y+(x+y-7)-(4y-12+x)=
д)(a-b)-(c-b)-(a-c)=
е)-(a-b)-(b-c)-(c-a)=
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