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=2x/(x+8y)(x-8y(-(x+8y)/(x+8y)(x-8y)
=(2x-x-8y)/(x+8y)(x-8y)
=(x-8y)/(x+8y)(x-8y)
=1/(x+8y)
=(2x-x-8y)/(x+8y)(x-8y)
=(x-8y)/(x+8y)(x-8y)
=1/(x+8y)
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