Write down the solution for this math problem: Solve 39 = 6*a + 27 for a.
answer: 2

Write down the solution for this math problem: Solve 61*a - 15*a + 49*a + 7203 = -52*a for a.
answer: -49

Write down the solution for this math problem: Solve -137*d + 361*d = 148*d + 138*d - 2728 for d.
answer: 44

Write down the solution for this math problem: Solve -1637*a + 1628*a = -54 for a.
answer:
6