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2x+y=3 /*2
x-2y=-1
4x+2y=6 dodajemy stronami
5x=5
x=5/5
x=1
2*1+y=3
y=3-2
y=1
x=1 y=1
2x+ y= 3 /* 2
x- 2y+ 1= 0
4x+ 2y = 6
5x+1= 6 /-1
5x= 5 / :5
x=1
2x+ y =3
x=1
2+y = 3 / -2
x=1
y=1
x=1