Solve equation X/4-7=-3

This could mean two things from how you've written it.

It could mean there is an X with the denominator 4 or it could mean there's an X with the denominator 4-7.

I am going to work with the first one and assume the 7 is separate. Apologies if that is incorrect.

First, I would add the 7 to both sides.

This leaves you with X/4 = 4

Then, multiply both sides by 4, to get X on its own.

This leaves X=16, which is the answer.