Раскройте скобки:
1) -(2-3a)+(7a-2)
2) -(2-3a)-(7a-2)
3) -(2-3a)-(2-7a)
4)-5-(1-9y)-(22y-4)
5) 5b-(6a+a)-(a-6b)
6) (6x-8)-5x-(4-9x)
7) 2-3+(3x-2)
8) (4-x)-(5-2x)+(4x-8)
Помогите пожалуйста
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