Question 335566
{{{(16y/x - x/y) / (-4/x + 1/y)}}}
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{{{((16y^2-x^2)/(xy))/(-4y+x)/(xy)}}}
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{{{((16y^2-x^2)/(xy))*((xy)/(-4y+x))}}}
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{{{((4y+x)(4y-x))/(xy)*(xy)/(-(x+4y))}}}
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{{{-(4y-x)}}}