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Total canicas = 25
Canicas de Ana = x
Canicas de Luis = x - 7
x + x - 7 = 25
2x - 7 = 25
2x = 25 + 7
2x = 32
x = 32/8
x = 16
Ana tiene 16 canicas
Luis tiene = x - 7 = 16 - 7 = 9 canicas.
Respuesta.
Ana tiene 16 canicas
Luis tiene 9 canicas
se divide entre 2(18÷2)y eso me da 9 canicas