$-13x^2 -8y^2 +5x $
Work Step by Step
We simplify by removing the parentheses and then add the like terms as follows: $$ (-13x^2 - 3y^2 - 4y) - (-5x - 4y + 5y^2)\\ =-13x^2 - 3y^2 - 4y +5x + 4y - 5y^2\\ =-13x^2 -8y^2 +5x .$$
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