jedna druga x + y = 3 x-3y=1
1/2x+y=3
x-3y=1
x+2y=6
-x-2y=-6
-5y=-5
y=1
-x-2=-6
-x=-4
x=4
1/2x+y=3 /*3
1,5x+3y=9
2,5x=10 /:2,5
0,5*4+y=3
2+y=3
y=3-2
x=2,5
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1/2x+y=3
x-3y=1
x+2y=6
x-3y=1
-x-2y=-6
x-3y=1
-5y=-5
y=1
-x-2=-6
-x=-4
x=4
x=4
y=1
1/2x+y=3 /*3
x-3y=1
1,5x+3y=9
x-3y=1
2,5x=10 /:2,5
x=4
0,5*4+y=3
2+y=3
y=3-2
y=1
x=2,5