Question 64258
(1/4Z+1/3)(1/4Z-1/5)
1/4X*1/4Z+1/4Z*1/3-1/5*1/4Z+1/3*-1/5
1/16Z^2+1/12Z-1/20Z-1/15
1/16Z^2+(5/60Z-3/60Z)-1/15
1/16Z^2+2/60Z-1/15
----------------------------------------------------------------------