Find the quotient of 9x3−21x2+12x÷3x.

3x2−7x+4x3 x squared minus 7 x plus 4 over x

6x2−18x+96 x squared minus 18 x plus 9

3x2−7x+x43 x squared minus 7 x plus x over 4

3x2−7x+43 x squared minus 7 x plus 4