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d in (-oo:+oo)
7-d-(5*d) = -17 // + 17
7-d-(5*d)+17 = 0
7-d-5*d+17 = 0
24-6*d = 0 // - 24
-6*d = -24 // : -6
d = -24/(-6)
d = 4
d = 4
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