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y-druga
x+y=600/*-(11)
1.15x+1.1y=672/ *10
-11x+(-11y)=-6600 }po srodku +
11.5x+11y=6720 }
-11x+(-11y)+11,5x+11y=-6600+6720
0,5x=120
x=240
y=600-240=360
x=240
y=360