Answer:
B
Step-by-step explanation:
Since the ratio of sides is 4 to 3, the proportion is:

x =
9
Out of what? Nothing is shown. :(
change the 6 ito - 6 by turning to left side then you will have -3 -6 now you can add them (- + -) is + so you can add them the sign of 6 is greater so the answer is -9