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dañadas= d
b+d=50
b=50-d
paga 1000 por cada buena, le pagan 700 por cada dañada
1000b-700d=33000 se saca factor común
100(10b-7d)=33000
10b-7d=33000/100
10(50-d)-7d= 330
500-10d-7d=330
170=17d
d= 10
b= 50-10= 40