Answer :

apologiabiology
so solve for r
try to isolate the placeholder

1+r/9=0
subtract 1 from both sides
r/9=-1
multiply both sides by 9 to clear fraction (because r/9 times 9/1=r/1 times 9/9=r)
r=-9

tada
Panoyin
1 + r = 0
   9      1
1 + r = 0
- 1      - 1
     r = -1

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