Q: Solve -3*w = 9 + 12 for w.

A: -7

Q: Solve 0 = -200*f + 186*f + 56 for f.

A: 4

Q: Solve -6270*a - 1260 = -6225*a for a.

A: -28

Q: Solve 25505 + 561871 = 1109*i - 5925*i - 3342*i for i.

A:
-72