A：-2x+3x=x
B：6xy2÷2xy=3y
C：（-2x2y）3=-6x6y3
D：2xy2•（-x）=-2x2y2
_____ Li Bai, a great Chinese poet, was born is known to the public, but some won’t accept it.
有一位思想家，在其社会主张上，理想和功利是并存的。但他倡导的功利并非一己之私利，而是天下之公利。这位思想家是（ ）
