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y - waga melona
{x = 2y + 1
{y = 1/3x + 1
{x-2y=1
{-1/3x + y =1 /*3
{x-2y=1
{-x+3y= 3
========
y=4
x-2*4 = 1
x-8 = 1
x=8+1
x=9
Odp. Arbuz waży 9kg. ( a melon 4 kg)