Easy
Subtract (−9n4+8)−(−9n4+2n3+5n4)(-9 n^{4}+8)-(-9 n^{4}+2 n^{3}+5 n^{4})(−9n4+8)−(−9n4+2n3+5n4)
−2n3−5n4+8 -2 n^{3}-5 n^{4}+8−2n3−5n4+8
2n3+5n2+82 n^{3}+5 n^{2}+82n3+5n2+8
n3−5n−3 n^{3}-5 n-3n3−5n−3
2n3+5n2+82 n^{3}+5 n^{2}+8 2n3+5n2+8
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