Solve for x. help please lol

Answer:
x = 18
Step-by-step explanation:
given that the 3 lines are parallel then the parallel lines divide the transversals proportionally , that is
[tex]\frac{3}{9}[/tex] = [tex]\frac{6}{x}[/tex] ( cross- multiply )
3x = 54 ( divide both sides by 3 )
x = 18