Question

Find the value of x that makes the expression equivalent. (35 points)

7(8 - x); 56 - 21

Answer 1

Answer: x=3

Explanation:

7(8-x)=56-21

56-7x=35

-56 -56 (subtract 56 from both sides)

-7x=-21

/-7 /-7 (divide each side by -7)

x=3

Answer 2

x=3

Explanation:

7(8-x)=56-21

Distribute the 7

7*8 -7x = 56-21

56 - 7x = 56-21

Since there is a 56 on each side , subtract 56 from both sides

56-56 - 7x = 56-56-21

-7x = -21

Divide each side by -7

-7x/-7 = -21/-7

x =3