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x:4=12
x=48
a - wiek Krzysia
(x+a):5=11
(48+a):5=11
48+a=55
a=7
Krzyś ma 7 lat
________________ = 12
4
A+Ja+O+Ju =48
A+Ja+ O+ Ju +x = 11
48+x
________ = 11
5
48+x=55
x= 7