Question:
Solve -54*u + 84 = 30 for u..

Answer:
1

Question:
Solve 9204*d - 9731*d = -36890 for d..

Answer:
70

Question:
Solve -5851 = 107*d - 6600 for d..

Answer:
7

Question:
Solve -2*a = 3*a + 25 for a..

Answer:
-5