Question:
Solve -153*y + 31*y = -59*y - 1260 for y..

Answer:
20

Question:
Solve 6209*w - 6239*w = 270 for w..

Answer:
-9

Question:
Solve 0 = -84*x - 1270 - 2275 + 545 - 2964 for x..

Answer:
-71

Question:
Solve -18*r + 58*r + 442 = 6*r for r..

Answer:
-13