What is the coefficient of x2y2 in the algebraic expression – x2y2 + 7x2y2 + 7x2 – 7y2 + 6x2y2?
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What is the coefficient of x2y2 in the algebraic expression – x2y2 + 7x2y2 + 7x2 – 7y2 + 6x2y2?