How do you do this problem?

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How do you do this problem? A hypothetical element, D, consists of two stable isotopes. the first stable isotope, 32(<- superscript)D, has an actual mass of 31.5873 amu. the second stable isotope, 36(<- superscript)D, has an actual mass of 36.4173 amu. the atomic wieght of element D is 34.5623 amu. what are the isotopic abundances of the two stable isotopes?

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