Check the alternative in the options below that correspond to a non-equation of the 2nd degree.

a) x² + 2 = 2x + x²

b) x² + 3x = - 15

c) 3x² + 7x - 20=15

d) - 2x + 4x² = 150+3x

e) x² + 2x - 12 = 0

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