Question:
Solve 0 = s + 34*s for s..

Answer:
0

Question:
Solve 6*x + 4 = -14 for x..

Answer:
-3

Question:
Solve -3855*x + 2016 = -3939*x for x..

Answer:
-24

Question:
Solve 0 = -9*u + 686 - 668 for u..

Answer:
2