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f(3)=4/5*3-2
We move all terms to the left:
f(3)-(4/5*3-2)=0
We add all the numbers together, and all the variables
f^3-(4/5*3-2)=0
We get rid of parentheses
f^3+2-4/5*3=0
We multiply all the terms by the denominator
f^3*5*3-4+2*5*3=0
We do not support efpression: f^3
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