# How do you solve for u in the equation -9 + u = 4u?

Mar 12, 2018

$u = - 3$

#### Explanation:

$- 9 + u = 4 u$

$\implies - 9 = 4 u - u$

$\implies - 9 = 3 u$

$\implies - \frac{9}{3} = u$

$\implies \frac{- {\cancel{9}}^{3}}{\cancel{3}} = u$

$\implies - 3 = u$