# How do you solve ( 4f + 5 ) + ( 5f + 40 ) = 180?

Oct 2, 2015

color(blue)(f=15

#### Explanation:

$\left(4 f + 5\right) + \left(5 f + 40\right) = 180$

$\left(4 f + 5 f\right) + \left(5 + 40\right) = 180$

$9 f + 45 = 180$

$9 f = 180 - 45$

$9 f = 135$

$f = \frac{135}{9}$

color(blue)(f=15