Question:
Solve 617402*k - 617890*k = 41968 for k..

Answer:
-86

Question:
Solve -850*n - 18270 = 20*n for n..

Answer:
-21

Question:
Solve -153934 + 250283 = 3838*c + 1759*c - 345814 for c..

Answer:
79

Question:
Solve 0 = -5023*n + 5022*n - 5 for n..

Answer:
-5