Question:
Solve 0 = 137*n - 1912 - 3882 + 40 for n..

Answer:
42

Question:
Solve 521*m - 44653 = -985*m + 66791 for m..

Answer:
74

Question:
Solve 138*t + 38*t = 1094 + 490 for t..

Answer:
9

Question:
Solve 622 = 13*r + 583 for r..

Answer:
3