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d in (-oo:+oo)
2-(2*d)-(4*d) = -10 // + 10
2-(2*d)-(4*d)+10 = 0
2-2*d-4*d+10 = 0
12-6*d = 0 // - 12
-6*d = -12 // : -6
d = -12/(-6)
d = 2
d = 2
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