Question:
Solve 138 = -135*z - 2515 - 1397 for z..

Answer:
-30

Question:
Solve -6489*c + 119316 + 186034 = -1564*c for c..

Answer:
62

Question:
Solve 3439672*u + 17405 = 3439377*u for u..

Answer:
-59

Question:
Solve -130*d - 682*d - 2013*d = 3441*d - 31330 for d..

Answer:
5