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b in (-oo:+oo)
6*(4-4*b) = 72 // - 72
6*(4-4*b)-72 = 0
6*(4-4*b)-72 = 0
-24*b-48 = 0
-24*b-48 = 0
-24*b-48 = 0 // + 48
-24*b = 48 // : -24
b = 48/(-24)
b = -2
b = -2
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