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d in (-oo:+oo)
10 = (2/3)*d // - (2/3)*d
10-((2/3)*d) = 0
(-2/3)*d+10 = 0
10-2/3*d = 0 // - 10
-2/3*d = -10 // : -2/3
d = -10/(-2/3)
d = 15
d = 15
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