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x+y=1000
x=1 2/3y
1x+1 2/3y=2 2/3z
2 2/3z=1000 |:2 2/3
z=375
1x+1 2/3y=375
x=187,5
1 2/3y=187,5 |:1 2/3
y=112,5
Odp. x=187,5
y=112,5
Liczę na naj :D