2x+x⁹

The expression 2x + x^9 represents a polynomial equation. To simplify it, we can combine like terms by adding the coefficients of the same degree.

Since we have 2x + x^9, we only have two terms. The coefficient of the first term, 2x, is 2, and the coefficient of the second term, x^9, is 1.

Therefore, the simplified expression is x^9 + 2x.