-7
If someone has $2 then spends $9 they owe $7
so is minus seven
2 - 9 = -7
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Infinitely many times; you can always subtract 2 from whatever number you have in the series 9 - 2n.
I would subtract [ 2x (4x + 9) ] .
5/9-1/3 is the same as 5/9-3/9. This would then subtract out to be 2/9. (2 over 9)
It is not possible to subtract more from less.
2 minus -9 is 11.