Question:
Solve 783 = 604*n - 640*n - 9 for n..

Answer:
-22

Question:
Solve -491 = 37*a - 269 for a..

Answer:
-6

Question:
Solve -30992 - 35924 - 28760 = 2809*p - 8597 for p..

Answer:
-31

Question:
Solve 64*j = 65*j - 9 for j..

Answer:
9