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x-kapusta
y-groch
x+y=2,5
x=y*4
x+y=2,5
x/4=y
x+y=2,5
x=4y
x=2,5-y
2,5-y=4y
2,5=5y
y=0,5
x=4y
x=4*0,5
x=2
x+y=2+0,5=2,5(kg)
4x-waga kapusty
x+4x+2=4,5
5x=4,5-2
5x=2,5
x=0,5 waga grochu
4*0,5=2kg waga kapusty
lub
x waga grochu
4*x waga kapusty
4,5kg-2kg=2,5kg waga grachu i kapusty
x+4*x=2,5
5x=2,5
x=2,5/5
x=0,5 waga grochu 4*0,5=2 waga kapusty