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3/9=21/k proportion
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3/9=21/k proportion

User Ilya Ilin
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(3)/(9) = (21)/(k)\\\\(1)/(3)= (21)/(k)\\\\\sf Cross~multiply\\\\1(k) = 21(3)\\\\k = 21(3)\\\\\boxed{k = 63}
User Huppie
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