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d in (-oo:+oo)
6*(2-4*d) = -108 // + 108
6*(2-4*d)+108 = 0
6*(2-4*d)+108 = 0
120-24*d = 0
120-24*d = 0
120-24*d = 0 // - 120
-24*d = -120 // : -24
d = -120/(-24)
d = 5
d = 5
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