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c = b-a
do 1 podstawiasz
-4= a +b +b-a
b= -2
do 2 podstawiasz wyliczone b
-3 = 4a -4 -2 -a
3 = 3a
a = 1
z 3 rownania
c = -3
a =1 , b= -2 . c=-3
-3= 4a + 2b + c
0= a - b + c a=b-c
-4=b-c+b+c
-3=4b-4c+2b+c
-4=2b
-3=6b-3c /:-3
-4=2b
1=-2b+c
-4+1=2b-2b+c 1=-2b+c 1=-2b-3 b=-2
c=-3 0=a-b+c a=b-c a=1
a=1
b=-2
c=-3