1) 4а-(3+(5а-4)) 2) 7а-(4а+(8а-1)) 3) 5+(3а(6-7а))

4a-(3+(5a-4)) 4a-(3+5a-4)4a-(-1+5a)4a+1-5a-a+1-a=1a=-1

4a-(3+(5a-4))=04a-(3+5a-4)4a-(-1+5a)4a+1-5a-a+1-a=1a--1

1) 4а-(3+5а-4))4а-(-1+5а)4а+1-5а-а+12)7а-(4а+8а-1)7а-(12а-1)7а-12а+1-5а+13)5+(18а-21а²)5+18а-21а²-21а²+18а+5