[tex]( x^{2} +1)(3x-1)-(2x) ^{2}(3x-2)+7(3 x^{3} +3)\ \textless \ =\ \textgreater \ [/tex][tex]3 x^{3} - x^{2} +3x-1-(12 x^{3} -8 x^{2} )+21 x^{2} +21\ \textless \ =\ \textgreater \ [/tex][tex]3 x^{3}- x^{2} +3x-1-12 x^{3}+8 x^{2} +21 x^{2} +21=-9 x^{3}+28 x^{2} +3x+20 [/tex]
