If the #x# is multiplied by #1/4#, then

#1/4x +3 -3=4-3" "# subtract #3# from both sides

#1/4x =1" "# now multiply both sides by #4#

#x=4#

If #x# is in the denominator, then

#1/(4x) + 3 = 4#

#1/(4x) =1" "# multiply both sides by #4x#

#1=4x#

#x=1/4#

So the answer depends on if you meant for #x# to be in the denominator or multiplied by #1/4#.