16/7 - 2 1/4 + 5/2 = 71/28
=16/7 - 9/4 +5/2
=64/28 - 63/28 +70/28
=71/28
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x^7-x^6 is already in simplest form.
51
47 = 16384 43 = 64 → 47 - 43 = 16384 - 64 = 16320
Expressed as a mixed vulgar fraction in its lowest terms, 1 4/7 - 1/2 = 1 1/14, or one and one fourteenth.