_:ncce5558c56864ed78bab3d0693cd8411xb1
<http://schema.org/position>
"0"^^<http://www.w3.org/2001/XMLSchema#integer>
<https://pt.khanacademy.org/math/algebra/introduction-to-polynomial-expressions/adding-and-subtracting-polynomials/e/subtract-polynomials>