Question:
Solve -7 = p - 9 for p..

Answer:
2

Question:
Solve 0 = 3*n + 3*n + 18*n + 288 for n..

Answer:
-12

Question:
Solve -31*a + 16*a - 54*a = 1173 for a..

Answer:
-17

Question:
Solve 159*b + 73 = 5934 - 1250 for b..

Answer:
29