Question:
Solve 2770 - 9289 - 6844 = 581*a for a..

Answer:
-23

Question:
Solve 202*y - 287 = -41*y + 199 for y..

Answer:
2

Question:
Solve -2*s = 47 - 39 for s..

Answer:
-4

Question:
Solve -329*y + 148*y = -158*y - 345 for y..

Answer:
15