Find the sum of 7x² + 3xy — 5y² and 8x2 — 5xy — 6y²

A. 15x² + 2xy - 11y²
B. 15x² + 2xy + 11y²
C. 15x² - 2xy - 11y²
D. 15x² + 2xy + 11y²​

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