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f(2+1)=f(2)+6(2+1)+1
We move all terms to the left:
f(2+1)-(f(2)+6(2+1)+1)=0
We add all the numbers together, and all the variables
f3-(f2+63+1)=0
We add all the numbers together, and all the variables
f^3-(f2+63+1)=0
We get rid of parentheses
f^3-f2-63-1=0
We do not support efpression: f^3
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