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d in (-oo:+oo)
6*(4*d+2) = 84 // - 84
6*(4*d+2)-84 = 0
6*(4*d+2)-84 = 0
24*d-72 = 0
24*d-72 = 0
24*d-72 = 0 // + 72
24*d = 72 // : 24
d = 72/24
d = 3
d = 3
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