1 answer
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To fully expand:
-6y^5 * 5y^7 + -6y^5 * 2y + -6y^5 * 7 + 10 * 5y^7 + 10 * 2y + 10 * 7
To simplify:
-30y^12 - 12y^6 - 42y^5 + 50y^7 + 20y + 70