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d in (-oo:+oo)
-6*d-10 = -2*d-38 // + -2*d-38
38-6*d-(-2*d)-10 = 0
2*d-6*d-10+38 = 0
28-4*d = 0 // - 28
-4*d = -28 // : -4
d = -28/(-4)
d = 7
d = 7
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