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14-09-2015
Mathematics

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5 times the difference of a number and 20 is the same as half the sum of 4 more than 4 times a number

Respuesta :

14-09-2015

5 (20n) = .5 (4+4n)
100n = 2+2n
100n-2n = 2+2n-2n
98n = 2
n = 2/98
n = 1/49

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