Question

Solve 7(x + 3) = 2x + 1.

A. x = 3
B. x = 2
C. x = -4
D. x = -6​

Answer 1

x=-4

Explanation:

7(x+3)=2x+1

distribute 7

7x+21=2x+1

subtract 1 from both sides

7x+20=2x

subtract 7x from both sides

20=-5x

divide both sides by -5

x=-4

Answer 2

C

Explanation:

7(x + 3) = 2x + 1 ← distribute parenthesis on left side by 7

7x + 21 = 2x + 1 ( subtract 2x from both sides )

5x + 21 = 1 ( subtract 21 from both sides )

5x = - 20 ( divide both sides by 5 )

x = - 4