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d in (-oo:+oo)
d-(6*d)+5 = 15 // - 15
d-(6*d)-15+5 = 0
d-6*d-15+5 = 0
-5*d-10 = 0 // + 10
-5*d = 10 // : -5
d = 10/(-5)
d = -2
d = -2
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