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D+J=1960
Reemplazando:
J-150+J=1960
2J=2110
J=1055
D=1055 -150
D=905
Juan = m
Resolvemos :
m - 150 + m = 1960
m + m - 150 = 1960
2m - 150 = 1960
2m = 1960 + 150
2m = 2110
m = 2110/2
m = 1055
m - 150 =
1055 - 150 =
905
Solución :
David tiene = 1055 puntos
Juan tiene = 905 puntos