Question:
Solve -1006*z - 9963 = 4121 for z..

Answer:
-14

Question:
Solve -4659*i + 1621*i = -1548*i - 1598*i + 1620 for i..

Answer:
15

Question:
Solve -11161 = -1307*l - 58213 for l..

Answer:
-36

Question:
Solve -30*d - 108 = 39*d - 15*d for d..

Answer:
-2