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f(-2/3)=6(-2/3)^4+10(-2/3)^3+5(-2/3)^2+(-2/3)+1
We move all terms to the left:
f(-2/3)-(6(-2/3)^4+10(-2/3)^3+5(-2/3)^2+(-2/3)+1)=0
We can not solve this equation
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