Q: What is the solution?
Solve 856 = -57*x - 11*x + 108 for x.

A: -11

Q: What is the solution?
Solve 868 = -9478*r + 9450*r for r.

A: -31

Q: What is the solution?
Solve -219*o + 208*o = 11 for o.

A:
-1