Question:
Solve -7*u = 3 - 17 for u..

Answer:
2

Question:
Solve 219*r + 6115 + 2422 = -240*r - 4315 for r..

Answer:
-28

Question:
Solve 0 = -117*x + 28170 - 25479 for x..

Answer:
23

Question:
Solve -5*m + 27*m = -193 - 5 for m..

Answer:
-9