Problems
Value of expression 2
Value of expression 2
Find the value of expression for the given values of the variables $x$ and $y$.
$$
{x^2 - 2xy + 4y^2 \over x + 5} + {3x^2 - y^2 \over y - 7}
$$
\InputFile
Values of the variables $x$ and $y$.
\OutputFile
Print the value of expression up to thousandths.
Input example #1
1.000 -2.000
Output example #1
3.611