Question

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

Answer 1

1) 4а-(3+5а-4))
4а-(-1+5а)
4а+1-5а
-а+1

2)7а-(4а+8а-1)
7а-(12а-1)
7а-12а+1
-5а+1

3)5+(18а-21а²)
5+18а-21а²
-21а²+18а+5