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2x+3y=0
3x-3y=15
2x+3y=0
--------- +
5x=15
x=3
3-y=5
-y=5-3
-y=2
y=-2
Odp. x=3, y=-2.
2x+3y=0
-2x+2y=-10
2x+3y=0
+------------
5y=-10/:5
y=-2
y=-2
x-y=5
y=-2
x-(-2)=5
y=-2
x+2=5
y=-2
x=5-2
x=3
y=-2