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możemy np. p dodaniu stronami otrzymać: 2=2; 0=0
3x-2y=m/*3
-9x+ky=12
9x-6y=3m
-9x+ky=12
dodajemy stronami
m=-4
k=6
spr .9x-6y=-12
-9x+6y=12
0=0