Write in Standard Form (minus two x to the power of four plus seven x to the power of two y minus seven) plus(minus nine x to the power of three plus seven xy plus seven)

Write in Standard Form (-2x^4+7x^2y-7)+(-9x^3+7xy+7)
To write a polynomial in standard form, Clarify and then arrange the terms in descending order.
Delete parentheses.
Add the opposite terms in .
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