Question:
Solve -5527 - 950 - 255 = 187*r for r..

Answer:
-36

Question:
Solve 23*r + 13388 = 6678 + 6572 for r..

Answer:
-6

Question:
Solve 4*n = -10*n + 2*n - 120 for n..

Answer:
-10

Question:
Solve -13*r = -8*r for r..

Answer:
0