Question:
Solve -4080 - 3172 = -259*u for u..

Answer:
28

Question:
Solve -121*s + 723 = 719*s + 25923 for s..

Answer:
-30

Question:
Solve 0 = -3207*w - 15581 - 15069 + 48959 + 65073 for w..

Answer:
26

Question:
Solve -78 = -101*h + 932 for h..

Answer:
10