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