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x-4-wiek Ani
30-razem wiek Kasi i Ani
2x-4=30
2x=30-4
2x=26
x=13
Kasi ma 17 lat a Ania 13
y - wiek kasi
x + y = 30
x-4 = y << to wszystko w jednej klamrze ;)
x= 30 - y
30-y - 4 = y >> 2y = 26 y = 13
x = 13 +4 = 17
k - wiek kasi
a+k = 30
k-4=a
(k-4) + k = 30
k-4+k = 30
2k - 4 = 30 |+4
2k= 34 | /2
k = 17
a+17 = 30 |-17
a=13
Odp Kasia ma 17 lat a Ania 13 .