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9514 1404 393

Explanation:

Subtraction is the same as adding the opposite. The difference of fractions with the same denominator is the difference of the numerators expressed over their common denominator.

  [tex]\dfrac{12}{13}+\left(\dfrac{-1}{13}\right)\\\\=\boxed{\dfrac{12}{13}}-\boxed{\dfrac{1}{13}}\\\\=\boxed{\dfrac{11}{13}}[/tex]

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