Question:
Solve 55*n = 60*n + 25 for n..

Answer:
-5

Question:
Solve 0 = -25*a + 19 + 31 for a..

Answer:
2

Question:
Solve 7*m + 3*m - 50 = 0 for m..

Answer:
5

Question:
Solve -15*u - 16 = -19*u for u..

Answer:
4