Question:
Solve -z - 49 = 16 + 20 for z..

Answer:
-85

Question:
Solve -567*s + 993080 - 987410 = 0 for s..

Answer:
10

Question:
Solve 151*i - 433*i = 151*i + 866 for i..

Answer:
-2

Question:
Solve 0 = -4*z + 58 - 34 for z..

Answer:
6