Write down the solution for this math problem: Solve 50*j = 40*j - 50 for j.
answer: -5

Write down the solution for this math problem: Solve -163 - 2237 = 150*n for n.
answer: -16

Write down the solution for this math problem: Solve 21742289*x - 21742664*x + 750 = 0 for x.
answer: 2

Write down the solution for this math problem: Solve 13*a - 269 = -269 for a.
answer:
0