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d in (-oo:+oo)
d/(-6) = -3/4 // + -3/4
d/(-6)-(-3/4) = 0
d/(-6)+3/4 = 0
3/4-1/6*d = 0 // - 3/4
-1/6*d = -3/4 // : -1/6
d = -3/4/(-1/6)
d = 9/2
d = 9/2
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