Question:
Solve 642 - 261 = -130*w + 3*w for w..

Answer:
-3

Question:
Solve -60*n = 7*n + 1287 - 282 for n..

Answer:
-15

Question:
Solve -175*i = 314 - 3289 for i..

Answer:
17

Question:
Solve 355*r - 4793 - 6922 = -355 for r..

Answer:
32