f(21)=6*21+9

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Solution for f(21)=6*21+9 equation: 



f(21)=6*21+9

We move all terms to the left:

f(21)-(6*21+9)=0

We add all the numbers together, and all the variables

f21-135=0

We add all the numbers together, and all the variables

f^21-135=0

We do not support efpression: f^21

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