Question:
Solve -39*d - 100 = -19*d for d..

Answer:
-5

Question:
Solve -197*k - 204 + 359 = -20 - 613 for k..

Answer:
4

Question:
Solve -12095*r - 455*r - 577300 = 0 for r..

Answer:
-46

Question:
Solve 75114*y = 75346*y - 1342 - 3298 for y..

Answer:
20