question: Teacher asked me this: Solve -228 - 144 = -118*d + 87*d for d.
++++++++++
answer: 12
Solve 43*s = 39*s - 16 for s.
Solve this plz.

A: -4
QUESTION: Math problem: Solve 81492 = 1859*i - 61651 for i.
ANS: 77
Q: What is the solution?
Solve 89*f = -14*f - 721 for f.

A: -7
Write down the solution for this math problem: Solve 321*x = 169*x - 1825 - 1215 for x.
answer: -20
QUESTION: Math problem: Solve 347 = 231*o - 115 for o.
ANS:
2