помогите ДАЮ 25 БАЛЛОВ
1. - ( - 2х + 7 ) - ( 2х - 1) =
2. 3а + ( 5b - 6а) + 7b =
3. - ( х - 3)+2 =
4. - 15 + ( -6 + у )=
5. - 15 - ( -6 + у ) =
6. ( а + 2b ) - ( 4а - b)=
7. ( 8а - b) - ( 3a - 5b) + ( 2a - 7b) =
1. - ( - 2х + 7 ) - ( 2х - 1) =
2. 3а + ( 5b - 6а) + 7b =
3. - ( х - 3)+2 =
4. - 15 + ( -6 + у )=
5. - 15 - ( -6 + у ) =
6. ( а + 2b ) - ( 4а - b)=
7. ( 8а - b) - ( 3a - 5b) + ( 2a - 7b) =
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................................Verified answer
1)2x-7-2x+1=-62)-3a+12b=3(4b-a)
3)-x+3+2=5-x
4)y-21
5)-15+6-у=-9-y
6)a+2b-4a+b=3b-3a=3(b-a)
7)8a-b-3a+5b+2a-7b=7a-3b