Question

Раскройте скобки
15-(7a+(4a-(a-9)))

Answer 1

15-(7a+(4a-(a-9)))=15-(7a+(4a-a+9))=15-(7a+4a-a+9)=15-7a-4a+a-9=6-10а

Answer 2

15-(7а+(4а-(а-9)))=15-(7а+(4а-а+9))=15-(7а+4а-а+9)=15-7а-4а+а-9=6-10а