Question:
Solve 0 = -a - 3 for a..

Answer:
-3


Question:
Solve 42812 + 42658 = -38*c + 83532 for c..

Answer:
-51


Question:
Solve 5420 = 791*i - 10400 for i..

Answer:
20


Question:
Solve -442*a - 18868 + 2429 = 2590 + 2187 for a..

Answer:

-48