Question:
Solve -2 = n + n for n..

Answer:
-1

Question:
Solve 6486 = 164*c - 45*c - 416 for c..

Answer:
58

Question:
Solve -48*m = -130*m + 328 for m..

Answer:
4

Question:
Solve -1384*u - 141*u + 85400 = 0 for u..

Answer:
56