Simplify quantity 18 x minus 6 over 9 x to the fifth power all over quantity 15 x plus 5 over 21 x squared

[(18x - 6) / 9x^5] / [(15x + 5) / 21x^2] 

The initial equation formulated would be:

[6(3x - 1) / 9x^5][21x^2 / 5(3x + 1)] 

By simplifying: 

[126x^2(3x - 1) / [45x^5(3x + 1)] 

14(3x - 1) / 5x^3(3x + 1) 

Therefore, the simplest form would be:

(42x - 14) / (15x^4 + 5x^3)

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[(18x - 6) / 9x^5] / [(15x + 5) / 21x^2] 

[6(3x - 1) / 9x^5][21x^2 / 5(3x + 1)] 

[126x^2(3x - 1) / [45x^5(3x + 1)] 

14(3x - 1) / 5x^3(3x + 1) 

(42x - 14) / (15x^4 + 5x^3)

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