f(4)=2f(3)-4

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Solution for f(4)=2f(3)-4 equation: 



f(4)=2f(3)-4

We move all terms to the left:

f(4)-(2f(3)-4)=0

We add all the numbers together, and all the variables

-(+2f^3-4)+f4=0

We add all the numbers together, and all the variables

f^4-(+2f^3-4)=0

We get rid of parentheses

f^4-2f^3+4=0

We do not support efpression: f^4

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