Yes because 4x3^x =12^x since the coefficient is added to the answer because it is in the 3.
Try using
Wolframalpha.com
It can solve any mathematical problem
The right amount to test would be 30.
200 is to many kids and 12 is not enough.
Hope this Helps!!
You will find teh GCF of that this will give you 9(x3-3) now you can fator it teh factors of these can be (x2+1) and (x-3)