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3(2y+x)=6 /*3
8y-9x=60
18y+9x=18
-------------- +
26y=78 /:26
y=3
2/3*3-3/4x=5
2-3/4x=5
-3/4x=3 /:(-3/4)
x=-3*4/3=-4
Odp. x=-4, y=3.