QUESTION: Math problem: Solve 129*u = 689 - 64 - 109 for u.
ANS: 4
QUESTION: Math problem: Solve 9*r + 16*r + 776 - 223 = -347 for r.
ANS: -36
QUESTION: Math problem: Solve 106*x = 640 - 112 + 1380 for x.
ANS: 18
QUESTION: Math problem: Solve -394*d = 1287 - 632 + 4861 for d.
ANS:
-14