Question 1174084
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Your equation is


    0.04x + 0.07x + 0.08x = 760  dollars.


Simplify 


            0.19x         = 760

              x           = 760/0.19 = 4000  dollars.


Thus each investment was  $4000;  the total investment was  $4000 + $4000 = $4000 = $12000.    <U>ANSWER</U>
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Solved.