Respostas

2014-04-02T21:42:20-03:00
X+y=75,00
x+8+y+1=75,00

x=75-y

(75-y)+8+y+1=75
(75-y)+9+y=75
75-9-y+y=75
66+y-y=75
y=9

x(par de chuteira) =75-9=R$ 66,00 
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