simplify complex fraction
3/4 + 1/3/1/6 + 3/4
= (3/4 + 1/3)/(1/6 + 3/4)= (3/4 + 1/3)/(1/6 + 3/4) Multiply numerator and denoiminator by 12=12(3/4+1/3) / 12(1/6 + 3/4)= (33 + 14) / (2 + 3*3)= 13/11
