8. Select all expressions that are equivalent to 5x²-3x - 4
a. (3x² + 5x-2) + (2x² - 8x - 2)
b. (2x² - 6x-4) + (3x² + 3x + 4)
c. (6x² + 5x + 3) - (x²2x-1)
d. (x²-4)-(-4x² + 3x)
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