QUESTION: Math problem: Solve -6 + 21 = 3*s for s.
ANS: 5
QUESTION: Math problem: Solve 3*x + 72 = -15*x for x.
ANS: -4
QUESTION: Math problem: Solve 52*n + 990 = -248*n - 195*n for n.
ANS: -2
QUESTION: Math problem: Solve 47*u - 206*u = 130*u + 289 for u.
ANS:
-1