QUESTION: Math problem: Solve 61*k - 21 = 54*k for k.
ANS: 3
QUESTION: Math problem: Solve 6*k + 19 = 49 for k.
ANS: 5
QUESTION: Math problem: Solve 15*x - 34*x - 41 + 10922 = 98*x for x.
ANS: 93
QUESTION: Math problem: Solve -38*r + 9*r = 87 for r.
ANS:
-3