Question

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

Answer 1

`u=-3`

Explanation:

`-9+u=4u`

`=> -9=4u-u`

`=> -9=3u`

`=> -9/3=u`

`=> (-cancel9^3)/cancel3=u`

`=> -3=u`