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6/7+8/21-1/3

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6/7+8/21-1/3

⁶/₇ + ⁸/₂₁ – ¹/₃ need a common denominator

¹⁸/₂₁ + ⁸/₂₁ – ⁷/₂₁ = ¹⁹/₂₁

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