question: Teacher asked me this: Solve -6*a + 21 = 39 for a.
++++++++++
answer: -3
Solve 869*x - 1901 = -2634 - 3612 for x.
Solve this plz.

A: -5
QUESTION: Math problem: Solve 816*r + 3042*r + 4513*r = 108823 for r.
ANS: 13
Q: What is the solution?
Solve -24 = 7*r - 15*r for r.

A: 3
Write down the solution for this math problem: Solve -7*b + 17654 - 17606 = -22*b - b for b.
answer: -3
Write down the solution for this math problem: Solve -848*k + 7 = -847*k for k.
answer:
7