Question:
Solve 719*a + 189*a - 143913 = -1139*a + 430*a for a..

Answer:
89

Question:
Solve -25*k - 30 = 20 for k..

Answer:
-2

Question:
Solve -3*f = -2*f - 5*f for f..

Answer:
0

Question:
Solve -219*p - 121*p = 1921 - 221 for p..

Answer:
-5