Part 1/
5 + x - 14 = x - 7
We’ll cancel (X) from both sides;
5 - 14 = -7
-9 = -7
Since, -9 = -7 is False, there is no solution.
———
Part2/
If we use x = -2, 0, 3
1) Case of X = -2
5 + (-2) - 14 = (-2) - 7
5 - 2 - 14 = -2 - 7
3 - 14 = -9
-11 = -9 .... False / No Solution
2) Case of X = 0
5 + (0) - 14 = (0) - 7
5 - 14 = -7
-9 = -7 ... False / No Solution
3) Case of X = 3
5 + (3) - 14 = (3) - 7
8 - 14 = -4
-6 = -4 ... False / No Solution
Answer
Its 12 months
Explanation
According to IRS, it allows for a single tax-free rollover of a 529 account per beneficiary in a 12-month period. This 12 month rule should not be violated because it can result to a 10% penalty on the earnings. However, transfers across siblings are not considered rollovers.
3. the first one.
4. I would say the third one