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d in (-oo:+oo)
3-(2*d) = 15 // - 15
3-(2*d)-15 = 0
3-2*d-15 = 0
-2*d-12 = 0 // + 12
-2*d = 12 // : -2
d = 12/(-2)
d = -6
d = -6
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