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what + what = 15  and their diffrence is 7

 Dec 13, 2020
 #1
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x+y = 15     so x = 15-y

   and

 

x-y = 7

(15-y) - y = 7

15 -2y = 7

-2y = -8

y = 4      x = 15-y = 11

 Dec 13, 2020

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