Question:
Solve -2810*l = -2776*l - 306 for l..

Answer:
9

Question:
Solve -5809 - 3881 = 266*c + 104*c + 200*c for c..

Answer:
-17

Question:
Solve 4076 = -123*c + 594*c + 723*c + 14822 for c..

Answer:
-9

Question:
Solve 0 = 523*u + 588*u - 28140 - 19633 for u..

Answer:
43