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x+y=340,15/-y
x+½y=220,1
x=340,15-y
340,15-y+½y=220,1/*2
x=340,15-y
680,30-2y+y=440,2
x=340,15-y
-y+680,30=440,2/-680,30
x=340,15-y
-y=-240,1/(-1)
x=340,15-y
y=240,1
x=340,15-240,1
y=240,1
x=100,05
y=240,1
x- liczba pierwsza
y- liczba druga