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2x+y=8
x+0,5(jedna druga)y=n
y=8-2x
x+0,5(8-2x)=n
y=8-2x
x+4-x=n
y=8-2x
0=n+x
b)przeciwnych współczyników
2x+3y=n /*3
3x-2y=2 /*-2
6x+9y=3n
-6x+4y=-4
13y=3n-4 /:13
y=(3n-4)/13