Question

Hey guys....
please help me to solve....
Evaluate {(7)-¹–(8)-¹}–{(3)-¹–(4)-¹}-¹

please...urgent..​

Answer 1

{1/7 - 1/8}- {1/3 - 1/4}

= 1/56 - 1/12

=( 3-14)/168

= -11/168