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Tenis D
gasto 1/2D
queda 1/2D
gasto 1/5(1/2D) = 1/10D
queda 23000
Entonces
1/2D + 1/10D + 23000 = D
multiplicando todo por 10
5D + D + 230000 = 10D
230000 = 10D - 6D
= 4D
D = 230000/4
= 57500
TENIA $57500