Раскройте скобки.Приведите подобные слагаемые.Упростите полученное выражение.
1.-10+4(а-3)
2.7y-2(3y+8)
3.-4(8n-7)-28n
4.3b-6(2-4b)
5.7(c-3)-6(c+2)+(4-2c)
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