Question:
Solve 15*k = -4*k - 131 - 97 for k..

Answer:
-12

Question:
Solve -4306*w = 10224*w - 217950 for w..

Answer:
15

Question:
Solve 1221515*y - 1221450*y + 2925 = 0 for y..

Answer:
-45

Question:
Solve 6212*a = -2150*a - 762*a + 1104004 for a..

Answer:
121