QUESTION: Math problem: Solve 31*k + 200 = 131*k for k.
ANS: 2
QUESTION: Math problem: Solve 76*j - 81*j - 5 = 0 for j.
ANS: -1
QUESTION: Math problem: Solve 0 = -134*r + 79*r + 81*r for r.
ANS: 0
QUESTION: Math problem: Solve 0 = -258*a - 41*a - 897 for a.
ANS:
-3