You can 
put this solution on YOUR website! .
If x > 5, then all the expressions under the absolute value operator
are positive.   if x > 5,  then  y=|x-3|+|x+2|-|x-5| = (x-3) + (x+2) - (x-5) = (x+x-x) + (-3+2+5) = x + 4.    ANSWER
    if x > 5,  then  y=|x-3|+|x+2|-|x-5| = (x-3) + (x+2) - (x-5) = (x+x-x) + (-3+2+5) = x + 4.    ANSWER
Solved and explained.
You do not need to use complicated formula.
Everything is clear from simple explanation, which is based on the definition of absolute value.