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Ernesto=x+3
Luis=x+5
(x+3)+(x+5)+(x)=58
x+3+x+5+x=58
3x+8=58
3x=58-8
3x=50
x=50/3
x=16,67
Mercedes=16.67
Ernesto=19.67
Luis=21.67
Comprobación=16.67+19.67+21.67=58.01