Question:
Solve 9281 = -11*x + 9215 for x..

Answer:
-6

Question:
Solve 62*w = 66*w + 12 for w..

Answer:
-3

Question:
Solve 0 = 2560*r - 2504*r - 874 + 4290 for r..

Answer:
-61

Question:
Solve 12*d + 15*d = 27 for d..

Answer:
1