Question 42987
Your only problem seems to be what's absolute value, so let's define it:

"The absolute value  of a real number is its numerical value without regard to its sign."

Or, where |a| denotes the absolute value of a:

|a| = a if {{{a >= 0}}}
|a| = -a if {{{a < 0}}}

Therefore, with no regard to the evil signs, your answer is {{{-25}}}.