Write down the solution for this math problem: Solve 17*i - 4 + 21 = 0 for i.
answer: -1

Write down the solution for this math problem: Solve -4*d - 8 = 4*d for d.
answer: -1

Write down the solution for this math problem: Solve -33*f = 61*f + 26*f - 6829 - 851 for f.
answer: 64

Write down the solution for this math problem: Solve 427*y + 270*y - 84*y - 25427 = 2158 for y.
answer:
45