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d in (-oo:+oo)
2*d+8 = 28-2*d // - 28-2*d
2*d-(-2*d)-28+8 = 0
2*d+2*d-28+8 = 0
4*d-20 = 0 // + 20
4*d = 20 // : 4
d = 20/4
d = 5
d = 5
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