when x = 3 and y = 5

3/4

Step-by-step explanation:

5x^8

20 x^7

5/20  =1/4

x^8/x^7    When dividing exponents with the same base, we subtract the exponents  

x^(8-7)

x^1

so

5x^8

20 x^7

= 1/4 x

Let x =3

1/4 *3

3/4

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146%

step-by-step explanation: