Question:
Solve 12*n - 29 = -10 - 7 for n..

Answer:
1

Question:
Solve 0 = 2*i - 12 + 4 for i..

Answer:
4

Question:
Solve -57 + 21 = -18*v for v..

Answer:
2

Question:
Solve -72*d + 100 - 672 = -28*d - 44 for d..

Answer:
-12