Easy
Subtract (6a3+7a2)−(5a3+9a2+a)(6 a^{3}+7 a^{2})-(5 a^{3}+9 a^{2}+a)(6a3+7a2)−(5a3+9a2+a)
a3−2a2−aa^{3}-2 a^{2}-aa3−2a2−a
a3+2a2+aa^{3}+2 a^{2}+aa3+2a2+a
a3+2a a^{3}+2 aa3+2a
a2+2aa^{2}+2 aa2+2a
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