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x-ula
2x+x=26
3x=26
x=8,6
8,6*2=17,2
odp kasia ma ok 17lat , a ula ok 9
Kasia 2x lat
razem 26 lat
3x=26
x=26:3=≈8,7lat - ula
8,7*2=17,4 lat - Kasia