Question: What is the solution?

Solve 0*u - 15 = -5*u for u.

Answer: 3

Question: What is the solution?

Solve 243*z - 194*z = 343 for z.

Answer: 7

Question: What is the solution?

Solve 10*d = 346 - 336 for d.

Answer: 1

Question: What is the solution?

Solve -220*y + 13*y - 85*y = 5548 for y.

Answer:
-19