Question:
Solve -7 = -4*v - 3 for v..

Answer:
1

Question:
Solve 1725 = 30*k + 189*k + 126*k for k..

Answer:
5

Question:
Solve -862*n + 867*n = 15 for n..

Answer:
3

Question:
Solve 5*f + 7*f = 0 for f..

Answer:
0