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Mike + Fred = 5800 (1)
(Fred + 2000) + Fred = 5800
2*Fred = 5800 - 2000
2*Fred = 3800
Fred = 3900/2 = 1900 dollars (Fred's salary)
From equation (1), Mike = 5800 - Fred = 5800 - 1900 = 3900 dollars (Mike's salary).
Solved.
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