Sorry. You will need to recursively change the amount of negative Other Income until it matches (within a dollar at the worst) the line 5b amount.
I know this is a pain, but the problem is that the change in your taxable SS benefits is not linear with the change in your Other Income.
Still, if you would add a negative amount, take a snapshot of the resulting line 5b and 7a (which I hope has the same value as line 8 on Schedule 1, although it might not), note the change, then adjust the Other Income to be closer to the 5b amount, take another snapshot - it shouldn't take too long before you figure out an exact match.
Good luck!
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