Question 360635
{{{(3sqrt(196r)-5sqrt(r)+ 7sqrt(9r))}}}
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{{{(3sqrt(196r)-5sqrt(r)+ 7sqrt(9r))}}}
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{{{(3*14sqrt(r)-5sqrt(r)+ 7*3sqrt(r))}}}
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{{{(sqrt(3)*(52-5+21))}}}
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{{{(68sqrt(3))}}}
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