Question:
Solve 761*s - 100 = 751*s for s..

Answer:
10

Question:
Solve 452*u - 6229 = -1215 + 3574 for u..

Answer:
19

Question:
Solve -7 = -2*a + 3*a for a..

Answer:
-7

Question:
Solve 200 = -173*s - 420 - 245 for s..

Answer:
-5