hi bffs please help me answer this question :)

Answer:
6.0
Step-by-step explanation:
if 10 is multiplied by 1.5 it turns into 15
is 13 is multiplied by 1.5 it turns into 19.5
so the opposite must be true
when x is multiplied by 1.5 it is 9
when 9 is divided by 1.5 it is x
9 / 1.5 is 6
so x is 6