Add $2 y^{2} + 7 y + 5; 3 y + 9; 3 y^{2} - 4 y - 3$

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Solution

$(2 y^{2} + 7 y + 5) + (3 y + 9) + (3 y^{2} - 4 y - 3)$

$= 2 y^{2} + 7 y + 5 + 3 y + 9 + 3 y^{2} - 4 y - 3$

$= (2 y^{2} + 3 y^{2}) + (7 y + 3 y - 4 y) + (5 + 9 - 3)$

$= 5 y^{2} + 6 y + 11$

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