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