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x+7-wiek Ani
2(x-2)=x+7-2
2x-4=x+5
2x-x=5+4
x=9
x+7=9+7=16
odp.Agnieszka ma 9 lat a Ania 16 lat
g → Agnieszka
n = g + 7
n – 2 = 2(g – 2)
Podstawiam pod n, g + 7
g + 7 – 2 = 2(g – 2)
g + 5 = 2g – 4
-g = -9
g = 9
Powracam do pierwszego równania i pod g wstawiam 9
n = 9 + 7
n = 16
Odp. Ania ma 16 lat, a Agnieszka 9.