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d in (-oo:+oo)
2*(4*d+2) = 52 // - 52
2*(4*d+2)-52 = 0
2*(4*d+2)-52 = 0
8*d-48 = 0
8*d-48 = 0
8*d-48 = 0 // + 48
8*d = 48 // : 8
d = 48/8
d = 6
d = 6
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