[tex]\displaystyle\bf\\3a^{3} b-2a^{2} b^{2} +7a^{2} b-8b-11-(6a^{3} b-3a^{2} b^{2} -7ab-4b-13)=\\\\=3a^{3} b-2a^{2} b^{2} +7a^{2} b-8b-11-6a^{3} b+3a^{2} b^{2} +7ab+4b+13=\\\\=(3a^{3}b- 6a^{3} b)+(3a^{2} b^{2} -2a^{2} b^{2}) +7a^{2} b+7ab+(4b-8b)+(13-11)=\\\\=-3a^{3} b+a^{2} b^{2}+7a^{2} b+7ab-4b+2[/tex]
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[tex]\displaystyle\bf\\3a^{3} b-2a^{2} b^{2} +7a^{2} b-8b-11-(6a^{3} b-3a^{2} b^{2} -7ab-4b-13)=\\\\=3a^{3} b-2a^{2} b^{2} +7a^{2} b-8b-11-6a^{3} b+3a^{2} b^{2} +7ab+4b+13=\\\\=(3a^{3}b- 6a^{3} b)+(3a^{2} b^{2} -2a^{2} b^{2}) +7a^{2} b+7ab+(4b-8b)+(13-11)=\\\\=-3a^{3} b+a^{2} b^{2}+7a^{2} b+7ab-4b+2[/tex]