Question

-3/7(21x+7)=-7x+11
A.) x=-7/8
B.) x=-7
C.) x=7
D.) x=-7/8

Answer 1

B

Explanation:

-3/7 (21x + 7) = -7x + 11

Let's simplify the left side real quick

Distribute the -3/7

(-3/7)21x + 7(-3/7)

-63x/7 + -21/7

-9x - 3 = -7x + 11

Move like terms to one side

Let's move the variables to the left side by adding both sides by 7x

-9x - 3 = -7x + 11

+7x +7x

-2x - 3 = 11

Add both sides by 3

-2x - 3 = 11

+3 +3

-2x = 14

Divide both sides by the coefficient, -2, to isolate the variable, x

-2x/-2 = 14/-2

x = -7