计算(x-3/2x+4)/{(5/x-2)-x-2}

(x-3/2x+4)/{(5/x-2)-x-2}
=（x-3）/2(x+2)/(5-(x+2)(x-2))/(x-2)
=(x-3)/2(x+5)×(x-2)/(3+x)(3-x)
=-(x-2)/2(x+5)(x+3)
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