# How do you solve for r in the formula S = L - rL?

Feb 21, 2016

Given expression:
$S = L - r L$
1)Subtract L from both sides.
the expression now becomes,
$S - L = - r L$
2)Divide by L on both sides.
$\frac{S - L}{L} = - r$
3)Multiply with a negative sign on both sides in the final step to obtain the expression in terms of r

$$                   (L-S)/L = r