7x+1+7 4x+4y^2 +2x 4y^2

请输入您的数学问题…… 7x+1+7-4x+4y^2 +2x-4y^2

问题

7 x + 1 + 7 - 4 x + 4 y^{2} + 2 x - 4 y^{2}

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