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d in (-oo:+oo)
6*(4*d+8) = 168 // - 168
6*(4*d+8)-168 = 0
6*(4*d+8)-168 = 0
24*d-120 = 0
24*d-120 = 0
24*d-120 = 0 // + 120
24*d = 120 // : 24
d = 120/24
d = 5
d = 5
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