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y=x+10 - waga niespodzianki
x+y=100
y=x+10
x+x+10=100
y=x+10
2x+10=100
y=x+10
2x=90
y=x+10
x=45
y=45+10
x=45
y=55
Odp. Jajko waży 45 g, a niespodzianka 55 g.