Q: Solve -6 + 4 = 2*d for d.

A: -1

Q: Solve -3821*f + 897 = -3890*f for f.

A: -13

Q: Solve 830 + 2410 = -367*b - 4100 for b.

A: -20

Q: Solve -2*w - 12*w + 0*w = -28 for w.

A:
2