Write down the solution for this math problem: Solve 7*d + 7*d - 140 = 0 for d.
answer: 10

Write down the solution for this math problem: Solve 6022*s = -6032*s + 11699*s + 16685 for s.
answer: 47

Write down the solution for this math problem: Solve -80 = 231*r - 444*r + 223*r for r.
answer: -8

Write down the solution for this math problem: Solve -729*b + 743*b + 364 = 0 for b.
answer:
-26