Question

What should be added to 9x to get 15x​

Answer 1

6x

Explanation:

Add '-9x' to each side of the equation.

15x - 9x = 9x - 9x

Substract like terms:

15x - 9x = 6x

Answer 2

15x - 9x = 6x

6x should be added to 9x to get 15x

... Hope this will help...