B => 2*2-6+2=0
4-6+2=0
-2+2=0
0=0
Punkt B lezy na prostej l
C=> 2* (-1/2)-1+2=0
-1-1+2=0
Punkt C lezy na prostej l
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B => 2*2-6+2=0
4-6+2=0
-2+2=0
0=0
Punkt B lezy na prostej l
C=> 2* (-1/2)-1+2=0
-1-1+2=0
-2+2=0
0=0
Punkt C lezy na prostej l