4x^2 + 6x - 9 + 9x^2 - 24x + 16 = 15x + 7
13x^2 - 18x + 7 = 15x + 7
13x^2 - 18x = 15x
13x^2 - 33x = 0
x(13x - 33) = 0
x = 0 or x = 33/13.
4x^2 + 6x - 9 + 9x^2 - 24x + 16 = 15x + 7
13x^2 - 18x + 7 = 15x + 7
13x^2 - 18x = 15x
13x^2 - 33x = 0
x(13x - 33) = 0
x = 0 or x = 33/13.