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a+2 = 2*(j+2)
j+7+2 = 2j+4
7+2-4 = 2j-j
5 = j
a = j+7
a = 5+7
a = 12
comprobación:
a+2 = 2*(j+2)
12+2 = 2*(5+2)
14 = 2*7
Respuesta:
Ana tiene 12 años
Juan tiene 5 años