question: Teacher asked me this: Solve 1933 - 909 = 256*l for l.
++++++++++
answer: 4

question: Teacher asked me this: Solve 47 = -11*k + 124 for k.
++++++++++
answer: 7

question: Teacher asked me this: Solve 39*a + 57 = -19 + 37 for a.
++++++++++
answer: -1

question: Teacher asked me this: Solve 2672789 = 33479*s - 57132*s for s.
++++++++++
answer:
-113