Question:
Solve -106*r = -88*r + 239 - 23 for r..

Answer:
-12

Question:
Solve -224*d + 689*d - 4218 = 254*d + 249*d for d..

Answer:
-111

Question:
Solve -30*q + 524 + 427 = 81 for q..

Answer:
29

Question:
Solve -17*q = -16*q for q..

Answer:
0