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Find the fourth term from the end in the...

Find the fourth term from the end in the expansion of `((3x)/(5)-(5)/(6x))^(9),x ne0`

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Finding the fourth term from the end in the expansion of `((3x)/(5)-(3x)/(5))^(9)`
`thereforeT_(4)=T_(3+1)=.^(9)C_(3)((-5x)/(6x))^(6)((3x)/(5))^(3)`
`=(9xx8xx7)/(3xx2xx1)*(5^(6))/(6^(6))xx(3^(3))/(5^(3))xx(x^(3))/(x^(6))`
`=(9xx8xx7xx5^(3))/(3xx2xx1xx2^(6)xx3^(3))xx(1)/(x^(3))=(875)/(144x^(3))`
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