Question 389272
{{{3/(2+sqrt(7))=(3/(2+sqrt(7)))*((2-sqrt(7))/(2-sqrt(7)))}}}
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{{{3/(2+sqrt(7))=(6-3*sqrt(7))/(4-2*sqrt(7)+2*sqrt(7)-7)}}}
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{{{3/(2+sqrt(7))=(6-3*sqrt(7))/(-3)}}}
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{{{3/(2+sqrt(7))=highlight(-2+sqrt(7))}}}
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