You forgot to include the options. This might help, though.
Answer:
x = 3
Step-by-step explanation:
=> 4x-5x+9=5x-9
=> -x-5x = -9-9
=> -6x = -18
=> x = 18/6
=> x = 3
7
B
It sounds most likely to the right answer
¯\_(ツ)_/¯