I’m not sure if this is right. Since the angles are congruent I set up a proportion: 6x/9x = 7x/11x-4 and simplified down to 0=66x(x-1.015). So the answer is 0, 1.015 but it can’t be zero so just the one. Not sure if it was right to do the proportion but hope this can get you somewhere. I might be completely off.
