`(3/(x-2)-6/(x^2-4))/(3/(x+2)+1/(x-2))`
`=(3/(x-2)-6/((x+2)(x-2)))/(3/(x+2)+1/(x-2))`
`=((3(x+2)-6)/((x+2)(x-2)))/((3(x-2)+1(x+2))/((x+2)(x-2)))`
Divide the fractions `(a/b)/(c/d)=(ad)/(bc)`
`=(3(x+2)-6)/(3(x-2)+1(x+2))`
`=(3x+6-6)/(3x-6+x+2)`
`=(3x)/(4x-4)`
`=(3x)/(4(x-1))`
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