Докажите, что при всех положительных значениях переменных x, y, z выполнено неравенство

[tex]\centerline{x^5y^4+x^5z^4+y^5x^4+y^5z^4+z^5x^4+z^5y^4 \geq 6x^3y^3z^3}[/tex]
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