5m Zen
X^4 4x^3+5x^2 4x+1u003d0
X^4 4x^3+5x^2 4x+1u003d0 pictures 5
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X^4 4x^3+5x^2 4x+1u003d0
X^4 4x^3+5x^2 4x+1u003d0
