Solve for x:- 7 + x = 21 x = ? Inverse operation 21 - 7 = x 21 - 7 = 14 x ⇒ 14 Check:- 7 + x = 21 x ⇒ 14 7 + 14 = 21 Yes, correct! x ⇒ 14

The anawer should be 14 because 7+14=21