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b in (-oo:+oo)
6*(1-(4*b)) = 270 // - 270
6*(1-(4*b))-270 = 0
6*(1-4*b)-270 = 0
6*(1-4*b)-270 = 0
-24*b-264 = 0
-24*b-264 = 0
-24*b-264 = 0 // + 264
-24*b = 264 // : -24
b = 264/(-24)
b = -11
b = -11
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