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-2a+b=3 /*(-1)
4a+b=-1
2a-b=-3 dodajemy stronami
6a= -4
a=-4/6
a= -2/3
-2(-2/3 )+b=3
4/3 =b=3
b=3 -1 1/3
b=1 2/3
a=-2/3 b=1 2/3