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d in (-oo:+oo)
4*d-(6*d)-7 = -25 // + 25
4*d-(6*d)-7+25 = 0
4*d-6*d-7+25 = 0
18-2*d = 0 // - 18
-2*d = -18 // : -2
d = -18/(-2)
d = 9
d = 9
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