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d in (-oo:+oo)
2*(4*d+4) = 48 // - 48
2*(4*d+4)-48 = 0
2*(4*d+4)-48 = 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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