question: Teacher asked me this: Solve 49*u + 288 + 251 = 0 for u.
++++++++++
answer: -11

question: Teacher asked me this: Solve 31*d + 66 + 58 = 0 for d.
++++++++++
answer: -4

question: Teacher asked me this: Solve -1489 = -20*k - 1649 for k.
++++++++++
answer: -8

question: Teacher asked me this: Solve -810*x + 984*x = 5220 for x.
++++++++++
answer:
30