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x + 3y = 4 / * (-2)
3x + 6y = 12
-2x - 6y = -8
x = 4
3 * 4 + 6y = 12
6y = 0
y = 0
x+3y=4/*(-3)
3x+6y=12
-3x-9y=-12 dodajemy stronami
-3y=0
y=0
x=4-3y
x=4-3*0
x=4
Rozw. jest para liczb: 4 i 0