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b in (-oo:+oo)
4*(-(6*b)-9) = -60 // + 60
4*(-(6*b)-9)+60 = 0
4*(-6*b-9)+60 = 0
4*(-6*b-9)+60 = 0
24-24*b = 0
24-24*b = 0
24-24*b = 0 // - 24
-24*b = -24 // : -24
b = -24/(-24)
b = 1
b = 1
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