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b in (-oo:+oo)
4*(2-(6*b)) = 56 // - 56
4*(2-(6*b))-56 = 0
4*(2-6*b)-56 = 0
4*(2-6*b)-56 = 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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