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9. How should be the polynomial equation x + 5x + 3x + 1 = 0 be written in standard form?
A. 5x3 + x + 3x6 + 1 = 0 C. 1 + x + 5x + 3x6 = 0
B. 1 + 3x + x + 5x3 = 0 D. +5x3 + x + 1 =0