Write down the solution for this math problem: Solve 2970 = 703*f - 109*f for f.
answer: 5

Write down the solution for this math problem: Solve f + 5 = 1 for f.
answer: -4

Write down the solution for this math problem: Solve -14*z + 25*z = 15*z + 28 for z.
answer: -7

Write down the solution for this math problem: Solve -1057 = 5*a + 1055 - 2137 for a.
answer:
5