QUESTION: Math problem: Solve 248 = -1937*f + 17681 for f.
ANS: 9
QUESTION: Math problem: Solve -66*a - 348 + 207 = 783 for a.
ANS: -14
QUESTION: Math problem: Solve -9150*k + 807 - 151 = -9191*k for k.
ANS: -16
QUESTION: Math problem: Solve -115*u - 39*u - 1723 + 1736 = -6917 for u.
ANS:
45