QUESTION: Math problem: Solve 571 = 16*d + 108*d - 669 for d.
ANS: 10
QUESTION: Math problem: Solve 187*a + 38*a + 260*a = -10185 for a.
ANS: -21
QUESTION: Math problem: Solve -2883 = -214*d + 327 for d.
ANS: 15
QUESTION: Math problem: Solve 854 = -4*i + 838 for i.
ANS:
-4