Question:
Solve -5*r - 17 = -7 for r..

Answer:
-2

Question:
Solve 0 = -2231*d - 164328 + 434279 for d..

Answer:
121

Question:
Solve 847 = -1574351*i + 1574428*i for i..

Answer:
11

Question:
Solve -384*k - 388*k + 625*k + 2058 = 0 for k..

Answer:
14