Question:
Solve -d + 0 = -4 for d..

Answer:
4

Question:
Solve 0 = -15*k - 83*k - 882 for k..

Answer:
-9

Question:
Solve -55*r - 8*r - 1338 = -17*r - 3500 for r..

Answer:
47

Question:
Solve -6*y + 80 = 10*y for y..

Answer:
5