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y - 2 liczba
x+y=120
y=120-x
1,2x+0,4y=2(x-y)
1,2x+0,4(120-x)=2x-2(120-x)
1,2x+48-0,4x=2x-240+2x
0,8x-4x=-240-48
-3,6x=-288
x=80
y=120-x=120-80=40
x=80
y=40