question: Teacher asked me this: Solve -13*s - 13 = 26 for s.
++++++++++
answer: -3

question: Teacher asked me this: Solve -69*t + 138 - 828 = 0 for t.
++++++++++
answer: -10

question: Teacher asked me this: Solve -35*d + 28*d = -14 for d.
++++++++++
answer: 2

question: Teacher asked me this: Solve 0 = 3939*l - 3502*l + 9177 for l.
++++++++++
answer:
-21