СРОЧНО! ДАЮ МНОГО БАЛЛОВ!!!
Раскройте скобки и по возможности упростите:
-3 (z+xy-6y)
-1 (a+b+c)
2 ( 21-a-66a)
10 ( -c-49+3a)
-6 (9-a-5b)
-a-5b
57 ( -a+b-c)
- ( 85-a-404b)
51 (b-10+a)
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