So the first step to solving this problem is to distribute the {1}{4}
to what's inside the parenthesis. This means multiply {1}{4} by 4x and 15.
After that, this is what you should have.
{4x}{4} + {15}{4} = 24
This should be simplified
1x = 24 - {15}{4}
{15}{4} is equal to 3.75
x = 20.25
20.25 is equal to {81}{4}
I think this is how it done
My Grandfather helped me a little
He is an Engineer who codes aircrafts so he knows lots of math
Hope This Helps