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The sum of 5x^2, - 7x^2, 8x^2, 11x^2 and...

The sum of `5x^2, - 7x^2, 8x^2, 11x^2 and -9x^2` is (A) `2x^2` (B) `4x^2` (C) `6x^2` (D) `8x^2`

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