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2x+5y=79
x=26-y
52-2y+5y=79
x=26-y
3y=27
x=17
y=9
y-5zł
x+y=26
2x+5y=79
x=26-y
52-2y+5y=79
x=26-y
3y=27
wynik
x=17---2zł
y=9---5zł
^^