(3x^{2} + 3) - (6x + 4) + (3x^{2} - 5x)

A:

B: 6x^{2} + x + 7

C: 6x^{2} - 11x - 1

D: 6x^{2} - 11x + 7

option C

6x^2 - 11x - 1.........................................................................

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