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dł. Wołgi= y
x-y = 3007
x+y = 384 + 10 do 4 potegi
x = 3007 + y
3007 + y + y = 10 384
x = 3007 + y
2 y = 10 384 - 3007 /:2
x= 3007+y
y=3688,5
x= 6695,5
y=3688,5
:)