Question

How do you solve `x^2/(x-4) - 7/(x-4) = 0`?

Answer 1

If the 'lower' parts are the same, you can add the 'uppers'

Explanation:

`->(x^2-7)/(x-4)=0`

This will only be `=0` if the top part `=0`

`->x^2-7=0->x^2=7->x=+-sqrt7` (two solutions)