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Zosia-x
Tata-y
3x=y
x=y-30
x=3x-30
-2x=-30
x=15
Zosia ma 15 lat.
2.
1 waga x-zając
3x+5=20
3x=20-5
x=5
2waga
20+20+y+2x=100
20+20+y+10=100
50+y=100
y=50
Wilk wazy 50kg