ok, the easiest way to start this would be to get rid of the fractions. fractions are pointless and just messy to deal with.
you want to get x by itself, so i would multiply everything by four. this will get rid of the fractions and also free up the x a little bit.
4(3-x/4=5/2)
12-x=10
now just solve like you normally do.
x=2