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d in (-oo:+oo)
-18 = 2*d-4*d+6 // - 2*d-4*d+6
-(-4*d)-(2*d)-18-6 = 0
4*d-2*d-18-6 = 0
2*d-24 = 0 // + 24
2*d = 24 // : 2
d = 24/2
d = 12
d = 12
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