Упростить!
1. 2b+(7a-9b)
2.-4x-(8p-4x)
3.(5+a)+(7a-5)
4.(4-8b)+(-8b-15)
5.3b-(5a-7b)
6.-3q-(8p-3q)
7.(2+3a)+(a-2)
8.(5-3b)+(-3b-11)
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