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d in (-oo:+oo)
4*(2*d+6) = 64 // - 64
4*(2*d+6)-64 = 0
4*(2*d+6)-64 = 0
8*d-40 = 0
8*d-40 = 0
8*d-40 = 0 // + 40
8*d = 40 // : 8
d = 40/8
d = 5
d = 5
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