3/1(u+1/6+a) a=6 u=3

Sub in numbers for variables

3/1 (3/1+1/6+6/1)

(3*1/1)(3/1+1/6+6/1)

(3*1/1)(18/6+1/6+36/6)

(3*1/1)(55/6)

(3)(55/6)

55/2