f(20)=20-9

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Solution for f(20)=20-9 equation: 



f(20)=20-9

We move all terms to the left:

f(20)-(20-9)=0

We add all the numbers together, and all the variables

f20-11=0

We add all the numbers together, and all the variables

f^20-11=0

We do not support efpression: f^20

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