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How much is a^2-3a greater than 2a^2+4a ...

How much is `a^2-3a` greater than `2a^2+4a ?`
(A) `a^2-7a` `
` (B) `a^2+7a` `
` (C) `-a^2-7a` `
` (D) ` a^2+7a`

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