Question

5/4+x=3/4 how do I figure this out

Answer 1

You could subtract 5/4 from each side of the equation.
Then it would say
x = -2/4 .

That's a perfectly true solution, but not a very attractive one.
To pretty it up, you could simplify the fraction if you felt like it,
and you would have
x = -1/2 .