Question:
Solve 0 = -4*r + 7 - 3 for r..

Answer:
1

Question:
Solve 0 = -39645*k + 39308*k + 16176 for k..

Answer:
48

Question:
Solve 34123 = 932*m + 10823 for m..

Answer:
25

Question:
Solve -163*l = -166*l - 15 for l..

Answer:
-5