18/(6+(sqrt(27m))186+(√27m) = 18/((sqrt(27m)+6)18(√27m+6)
Now (sqrt(27m)-6)/(sqrt(27m)-6)√27m−6√27m−6 is 1 so multiple that to 18/((sqrt(27m)+6)18(√27m+6), 18/((sqrt(27m)+6)18(√27m+6)*(sqrt(27m)-6)/(sqrt(27m)-6)√27m−6√27m−6 = (54sqrt(3m)-108)/(27m)54√3m−10827m
Now simplify