How do you simplify x+3(x+4)=20?

Sep 24, 2015

color(blue)(x = 2

Explanation:

$x + 3 \left(x + 4\right) = 20$

$x + 3 x + 3 \cdot 4 = 20$

$x + 3 x + 12 = 20$

$x + 3 x = 20 - 12$

$4 x = 8$

$x = \frac{8}{4}$

color(blue)(x = 2