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f(5+2)=f(5+1)+4f(5)
We move all terms to the left:
f(5+2)-(f(5+1)+4f(5))=0
We add all the numbers together, and all the variables
f7-(f6+4f5)=0
We add all the numbers together, and all the variables
f^7-(f6+4f5)=0
We get rid of parentheses
f^7-f6-4f5=0
We do not support efpression: f^7
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