Home > MC2 > Chapter 9 > Lesson 9.1.2 > Problem9-20

9-20.

Begin isolating x by subtracting 3 from both sides.

−3 + 24 = 3x + 3 − 3
21 = 3x

Divide both sides by 3.

$\frac{21}{3} = \frac{3x}{3}$

x = 7

Follow the methods presented in (a) and (b).

Begin by distributing.

2(x) − 2(6) = x − 14
2x − 12 = x − 14

2x = x − 2

Subtract x from each side.

x = −2

Follow the methods presented in (a) and (b).