15%2
13!3!2!/52p5
13!3!2!1!1!/52!
14*6
14*8
6 - 8x - 10 = x - 6 - 2x
4!3!2!/13!
9p+18[-1/36]=1
find p
9p-1/2=1
find x
2x+y=230
y+x=200
