Hola
2x+25=51
2x=51 -25
2x=26
x=26 ÷2
x=13 es la edad de Lucía.
comprobamos =
13+13 +25=
26 + 25=51
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Hola
2x+25=51
2x=51 -25
2x=26
x=26 ÷2
x=13 es la edad de Lucía.
comprobamos =
13+13 +25=
26 + 25=51