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d in (-oo:+oo)
40 = (2/11)*d // - (2/11)*d
40-((2/11)*d) = 0
(-2/11)*d+40 = 0
40-2/11*d = 0 // - 40
-2/11*d = -40 // : -2/11
d = -40/(-2/11)
d = 220
d = 220
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