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3x+4y=1 2/3
6x+3y=11/4
3x+4y=5/3 /*3
6x+3y=5/4 /*(-4)
9x+12y=5
-24x-12y=-5
-------------- dodajemy
-15x=0
x=0
3x+4y=5/3
3*0+4y=5/3
4y=5/3
y= 5/12