Are the x values of the given function of (F+G)(X)./
A possible answer is

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Pi is an irrational number and when you multiply a rational number with an irrational number, you end up with an irrational number.
18/50 is an equivalent fration because when simplified it equals to 9/25
Well, I don't know if the following work is exactly what you want but here it goes:
first:23
second: 23-3=20
third: 20-3=17
fourth:17-3=14
fifth: 14-3=11
sixth: 11-3=8
Hope thats what you wanted if not Ill do my best to figure out a different solution. Just comment or private message me For questions. :0
x would be 6 because you double 5 to get ten, so you double 3 to get 6