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