What is the equation to solve this problem

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

Isaac wants the equation below to have no solution when the missing number is placed in the box. which number should he place in the box?

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.