1.

`( 3125^x xx 5^9)/ 625 = (125)^-1`

Answer» `(3125^x xx5^9)/625 = 125^-1`
`=>(3125^x xx5^9)/5^4 = 1/5^3`
`=>(3125^x xx5^8) = 1`
`=>((5^5)^x xx 5^8) = 5^0`
`=>5^(5x+8) = 5^0`
`5x+8 = 0=> x = -8/5`


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