f(3)=21X+13

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Solution for f(3)=21X+13 equation: 



f(3)=21f+13

We move all terms to the left:

f(3)-(21f+13)=0

We add all the numbers together, and all the variables

f^3-(21f+13)=0

We get rid of parentheses

f^3-21f-13=0

We do not support efpression: f^3

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