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b in (-oo:+oo)
6*(8-(2*b)) = 132 // - 132
6*(8-(2*b))-132 = 0
6*(8-2*b)-132 = 0
6*(8-2*b)-132 = 0
-12*b-84 = 0
-12*b-84 = 0
-12*b-84 = 0 // + 84
-12*b = 84 // : -12
b = 84/(-12)
b = -7
b = -7
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