Subtract. Simplify, If possible.
(x-8)/(x) - (7x-53)/(11x)
Get a common denominator of 11x on the frist fraaction and we have
[11 ( x - 8) / 11x - (7x - 53) / 11x
[ 11x - 88 - 7x + 53 ] / 11x =
[ 4x - 35] / 11x