Question 589174
(This is an old question, but I guess I'll just answer it anyway, hehe)

Let x = the number that we're trying to find.


1) x-312=234
x=234+312
x=546


2) x/13=14
x=14*13
x=182


3) 3x+27=72
3x=72-27
3x=45
x=45/3
x=15