I have a big problem

please help me because I can not solve the problem we have presented to me is exactly the same.
I can not solve the x that the program fails me and tells me that the x is 56.
Nor do I understand.
2-54 25 * X = 56?????????

25*2-54:X=56
":" is the wrong operation in this context, use "/" instead:
[input]25*2-54/X=56[/input]