3ld-4l is less then or equal to 13-d

I do know how to solve this but I am not getting the answer -1/2 is greater than or equal to d but is less then or equal to 25/4. It will be appreciated if you can show me how my textbook says the answer above as the answer.

Question

3ld-4l is less then or equal to 13-d 

I do know how to solve this but I am not getting the answer -1/2 is greater than or equal to d but is less then or equal to 25/4. It will be appreciated if you can show me how my textbook says the answer above as the answer.

anonymous · Answer

I got -1/4 is greater than or equal to d but is less than or equal to 25/4 as the answer. when I solved it.

amistre64 · Answer

can you post your workings?

anonymous · Answer

sure no problem give me a second please

amistre64 · Answer

ive worked it out so im just waiting now :)