Question:
Solve -57*k + 7*k - 300 = 0 for k..

Answer:
-6

Question:
Solve 11*y + 2140 - 2239 = 0 for y..

Answer:
9

Question:
Solve 0 = 915*c - 922*c - 105 for c..

Answer:
-15

Question:
Solve 1246*c - 27545 = 317*c + 22621 for c..

Answer:
54