what same numbers should be added to each one of the numbers 15,23, 29,44 to obtain numbers which are in proportion
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15 + x = 29 + x
23+ x 44 + x
(15+x)(44+x) = (23+x)(29+x)
660 + 15x + 44x+ x² = 667 + 23x + 29x + x²
660 + 59x = 667 - 52x
7x = 7
x = 1
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