input: Write a python function to find the solutions of a quadratic equation.
  assert find_solutions(1, -3, 2) == ((1+0j), (2+0j))
  assert find_solutions(1, 2, 1) == ((-1+0j), (-1+0j))
  assert find_solutions(1, 0, -4) == ((-2+0j), (2+0j))
output: def find_solutions(a, b, c):
      import cmath
      d = b**2 - 4*a*c
      sol1 = (-b + cmath.sqrt(d)) / (2*a)
      sol2 = (-b - cmath.sqrt(d)) / (2*a)
      return (sol1, sol2)