Question 665406
He lost {{{5/7}}}, so he yet has {{{2/7}}}
{{{2/7}}}x = 172, where x is the number of original songs
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Multiply both sides by 7
2x = 1204
Divide both sides by 2
x = 602
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Check
{{{(5/7)(602) = (5)(86) = 430}}}
602 - 430 = 172
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