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d in (-oo:+oo)
2/3 = d/15 // - d/15
2/3-(d/15) = 0
2/3-1/15*d = 0 // - 2/3
-1/15*d = -2/3 // : -1/15
d = -2/3/(-1/15)
d = 10
d = 10
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