question: Teacher asked me this: Solve 18 = 3*l + 18 for l.
++++++++++
answer: 0

question: Teacher asked me this: Solve 27 = 222*i - 213*i for i.
++++++++++
answer: 3

question: Teacher asked me this: Solve -400*j + 1386*j + 19720 = 0 for j.
++++++++++
answer: -20

question: Teacher asked me this: Solve 1723 = -923*s + 2575 + 10224 for s.
++++++++++
answer:
12