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d in (-oo:+oo)
2*d+2 = 5*d-4 // - 5*d-4
2*d-(5*d)+2+4 = 0
2*d-5*d+2+4 = 0
6-3*d = 0 // - 6
-3*d = -6 // : -3
d = -6/(-3)
d = 2
d = 2
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