Question:
Solve 828*y = 823*y + 20 for y..

Answer:
4

Question:
Solve -61*q = -339 - 88 for q..

Answer:
7

Question:
Solve 551*g - 574*g = -207 for g..

Answer:
9

Question:
Solve 21*r = 31201 - 30844 for r..

Answer:
17