Problems
Value of variable 3
Value of variable 3
Find the value of the variable $y$ for a given real value of the variable $x$.
$$
y = {x^2 + 3x - 4 \over 2x - 3} - {x + 2 \over x^2 - 5x + 7}
$$
\InputFile
Value of the variable $x$.
\OutputFile
Print the value of the variable $y$ up to thousandths.
Input example #1
1
Output example #1
-1.000