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The Denominator-Split Error

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The denominator-split error divides across the terms of a denominator; a/(b + c) is not a/b + a/c.

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12/(2 + 4) is 12/6 = 2, but 12/2 + 12/4 is 6 + 3 = 9. The split wrecked the value.

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A summed denominator is one block; treat it whole.

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