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g(-2)=-6a+b+2=4
-2a-2+b=4
-6a+b=4-2
-2a+b=6
-6a+b=2
------------ _
-2a+6a=6-2
4a=4
a=1
3*(-2)+b+2=4
b=4-2+6
b=8
Odp. a=1, b=8.