Write in Standard Form (-2x^4+7x^2y-7)+(-9x^3+7xy+7)

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