16x⁵y⁴zxxz⁴ + 14xyz⁴xx⁵y²zy - 7x⁷yz²yz²yyz =
= 16x⁵⁺¹⁺¹y⁴z¹⁺⁴ + 14x¹⁺¹⁺⁵y¹⁺²⁺¹z⁴⁺¹ - 7x⁷y¹⁺¹⁺¹⁺¹z²⁺²⁺¹ =
= 16x⁷y⁴z⁵ + 14x⁷y⁴z⁵ - 7x⁷y⁴z⁵ =
= (16+14-7)x⁷y⁴z⁵ = 23x⁷y⁴z⁵
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16x⁵y⁴zxxz⁴ + 14xyz⁴xx⁵y²zy - 7x⁷yz²yz²yyz =
= 16x⁵⁺¹⁺¹y⁴z¹⁺⁴ + 14x¹⁺¹⁺⁵y¹⁺²⁺¹z⁴⁺¹ - 7x⁷y¹⁺¹⁺¹⁺¹z²⁺²⁺¹ =
= 16x⁷y⁴z⁵ + 14x⁷y⁴z⁵ - 7x⁷y⁴z⁵ =
= (16+14-7)x⁷y⁴z⁵ = 23x⁷y⁴z⁵