Question:
Solve 0 = 109*s - 536 - 772 for s..

Answer:
12

Question:
Solve -23*l + 40*l = 153 for l..

Answer:
9

Question:
Solve -42*a + 33*a + 38*a + 58 = 0 for a..

Answer:
-2

Question:
Solve 65*o - 24 = -24 for o..

Answer:
0