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