(3x+2)(-x^6+3x^5)+(3x+2)(-2x^6+x^5)+(x+1)(3x^6-4x

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(3x+2)(-x^6+3x^5)+(3x+2)(-2x^6+x^5)+(x+1)(3x^6-4x^5)=( )
A(3x^6-4x^)(2x+1)
B(3x^6-4x^5)(2x+3)
C-(3x^6)(2x+1)
B-(3x^6)(2x+3)

C的第一个括号里应该是3x^6-4x^5