question: Teacher asked me this: Solve 0 = -l - 4 + 7 for l.
++++++++++
answer: 3

question: Teacher asked me this: Solve 1219*k - 66402 = -83*k for k.
++++++++++
answer: 51

question: Teacher asked me this: Solve -1856 = 22*u + 5*u - 85*u for u.
++++++++++
answer: 32

question: Teacher asked me this: Solve -2284 + 3 = -389*r + 5888 for r.
++++++++++
answer:
21