The Answer Is n^2 Part II

Algebra

$\dfrac{31-2\delta_{1}}{1-2\delta_{1}} +\dfrac{31-2\delta_{2}}{1-2\delta_{2}}+\dfrac{31-2\delta_{3}}{1-2\delta_{3}}$

If $1,\delta_{1},\delta_{2},\delta_{3}$ are distinct fourth roots of unity, then evaluate the expression above.