question: Teacher asked me this: Solve 28*r = -636 + 2362 - 774 for r.
++++++++++
answer: 34

question: Teacher asked me this: Solve 5*k - 5*k - 7*k = 0 for k.
++++++++++
answer: 0

question: Teacher asked me this: Solve 48 = -25*h - 30*h + 47*h for h.
++++++++++
answer: -6

question: Teacher asked me this: Solve 628*z - 1631 + 12307 = 0 for z.
++++++++++
answer:
-17