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(12+12+12+12+x):5=11\*5
12+12+12+12+x=55
48+x=55\-48
x=7
Krzyś ma 7 lat
X-wiek Krzysia
(48+x):5=11
9⅗+⅕x=11
⅕x=1⅖/÷⅕
x=7
odp.Krzyś ma 7 lat