question: Teacher asked me this: Solve 4 + 0 = 2*r for r.
++++++++++
answer: 2

question: Teacher asked me this: Solve -10*h + 83*h = 438 for h.
++++++++++
answer: 6

question: Teacher asked me this: Solve 356*d + 30348 - 13260 = 0 for d.
++++++++++
answer: -48

question: Teacher asked me this: Solve 568*y - 5218*y = -97650 for y.
++++++++++
answer:
21