(13y9 15) - 9y9

The question might be like this

(13y^9 -15) - 9y^9

Now

= 13y^9 -15 - 9y^9

= 13y^9 - 9y^9 - 15

= 4y^9 - 15

Or

(13y^9 + 15) - 9y^9

= 13y^9 + 15 - 9y^9

= 13y^9 - 9y^9 + 15

= 4y^9 + 15

If not, then please clarify the question. thank

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