Answer:
=14x+16
Step-by-step explanation:
21x−(−16+7x)
=21x+−1(−16+7x)
=21x+(−1)(−16)+−1(7x)
=21x+16+−7x
=(21x+−7x)+(16)
14x+16
(21x)-(-16+7x)
Distribute the minus sign
21x+16-7x
Combine like terms
