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b = a+c+6
a+a+c+6+c=2
4a-2(a+c+6)=8
b = a+c+6
2a+2c+6=2
4a-2a-2c-12=8
b = a+c+6
2a+2c= -4
2a-2c=20 ==> 2c = 2a-20
b = a+c+6
2c=2a-20
2a+2a-20=-4
b = a+c+6
2c=2a-20
4a = 16 ===> a =4
2c = 2*4 - 20 ==> c =-6
b = a+c+6 ===> b = 4-6+6 =4