QUESTION: Math problem: Solve -9 = 8*r + 7*r - 249 for r.
ANS: 16
QUESTION: Math problem: Solve 105*c - 39055 = -40105 for c.
ANS: -10
QUESTION: Math problem: Solve 81 = -13*l - 2*l - 9 for l.
ANS: -6
QUESTION: Math problem: Solve 10*n = 78 - 38 for n.
ANS:
4