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70x+50y=1400
70x+50( 24-x)=1400
70x+1200-50x=1400
20x =1400-1200
x =200/20
X = 10 ( 10 chompas de cuero)
Y = 24-x
Y = 24-10
Y = 14 ( 14 chompas de jean)
MAriana vendio 10 chompas de cuero y 14 chompas de jean
Un abrazo y buena noche