B = 3x^2 ( x^3 + x ) + ( x^2 + 1 ) ( x^3 + 2x + 1 ) - ( 5x - 2x^2 ) : x

B = 3x^2 ( x^3 + x ) + ( x^2 + 1 ) ( x^3 + 2x + 1 ) - ( 5x - 2x^2 ) : x
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