Question:
Solve -37*a = 57 - 390 for a..

Answer:
9

Question:
Solve 28*i = 16*i for i..

Answer:
0

Question:
Solve 9*d + 46 = 37 for d..

Answer:
-1

Question:
Solve 51685*x - 51700*x + 285 = 0 for x..

Answer:
19