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The calculator tool used for adding the given polynomial is called as Adding polynomial calculator. Polynomial is a mathematical term which is a combination of variables and exponents. Polynomials usually have variables with different positive exponents and they can also have different numerical coefficients which forms a polynomial term.

The first step is to add the first two polynomials which have the same exponent and variable x².

This gives 4 x² +5 x² = 9 x²

Later add the third polynomial to the derived answer 9 x²

This is in turn equal to 9 x² +3 x² = 12 x²

The first step is to add the first two polynomials which have the same exponent and variable y³.

This gives y³ +6 y³ = 7 y³

Later add the third polynomial to the derived answer 7 y²

Which is in turn equal to 7 y³ +2 y³ = 9 y³