Question 372091
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Hi,
The sum of two numbers is 84
Let x represent one of the numbers, then (84-x) would be the other
Question states***
x = 3(84-x)
solving for x
x = 3*84 - 3x
4x = 252
x = 63, one of the numbers.  The other is 21.    (84-63)

checking our answer
63 = 3*21