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 <—7 shorts——–><———-left————><3tees>

[—-u—–][—-u—–][—-u—–][—-u—–][—-u—–]

 <——2u———–><———(7/3)u———> (2/9) x (3u) = (2/3)u

(2u) / 7 –  (2u/3)/3 = 8

(2u)/7 – (2u)/9 = 8   <——– x 63 on both sides

18u – 14u = 8 x 63

4u = 504  => u = 126

Amount of money left = 5u – 2u – (2/3)u = (7/3)u  = (7/3) x 126 = $294

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