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a+4c=0
----------- -
2b-4c=1
2b-4c=1 |x1| 2b-4c=1
b+2c=1 |x2| 2b+4c=2
-------------- -
-8c=-1
c = 1/8
a+4c=0
a+1/2=0
a= -1/2
a+2b=1
-1/2+2b=1
2b=1+1/2
2b=3/2
b = 3/4