Question

R
— = 4 (what is r?)
10

Answer 1

R
— = 4 
10

This is how you do it buddy

You would multiply both of your sides by 10 because you would like to get your variable alone. Your variable being R. 

R = 40

THAT'S YOUR ANSWER BABY!!!!!!!!!! YAS!

- Gives you thumbs up- 

Answer 2

$\frac{R}{10}=4$
$R= 4*10$
$R=40$

In short, R is 40.

Hope this helps !

Photon