A whole number is a fraction with a denominator of one
5/4x+3 = x-1/4
5/4x-x = -1/4-3
1/4x = -13/4
x = -13/4.4
x = - 13
Your answer is correct, your on the right track as well. Just flip the negative number to its respective location.
Good luck :)
The second one because it has a proportional relationship