question: Teacher asked me this: Solve 813 = 99*z + 810 + 6809 + 1906 for z.
++++++++++
answer: -88

question: Teacher asked me this: Solve -53*b + 6 = -47*b for b.
++++++++++
answer: 1

question: Teacher asked me this: Solve -27 = 4*d - 7 for d.
++++++++++
answer: -5

question: Teacher asked me this: Solve -20*l - 106*l = 1134 for l.
++++++++++
answer:
-9