Answer :
x/1-18x/13+15x/12
=so, the LCM of 13 and 12 equal to 156
then, 156/1×x=156x
156/13×18x=126x
156/12×15x=195x
After that,(156x- 126x+195x) divided by 156
so, the answer will come
135x/156
x/1-18x/13+15x/12
=so, the LCM of 13 and 12 equal to 156
then, 156/1×x=156x
156/13×18x=126x
156/12×15x=195x
After that,(156x- 126x+195x) divided by 156
so, the answer will come
135x/156