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d in (-oo:+oo)
1/2-(3*d) = -2 // + 2
1/2-(3*d)+2 = 0
1/2-3*d+2 = 0
5/2-3*d = 0 // - 5/2
-3*d = -5/2 // : -3
d = -5/2/(-3)
d = 5/6
d = 5/6
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