# How do you solve for d in cy-d=4d?

Mar 6, 2016

$d = \frac{c y}{5}$

#### Explanation:

$c y - d = 4 d$

What we do on one side must be done on thee other side also
(Golden rule of algebra)

Add $d$ both sides

$\rightarrow c y - d + d = 4 d + d$

$\rightarrow c y = 5 d$

Divide both sides by $5$

$\rightarrow \frac{c y}{5} = \frac{\cancel{5} d}{\cancel{5}}$

$\Rightarrow d = \frac{c y}{5}$