√36x+1+6√x/√36x-1-6√x=9.
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36x+1−6x36x+1+6x=36x+1−6x36x+1+6x×36x+1+6x36x+1+6x=(36x+1)2−(6x)2(36x+1+6x)2=72x+1+1236x2+x=9
72x+1236x
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