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d in (-oo:+oo)
30 = 5*d+d+6 // - 5*d+d+6
30-(5*d)-d-6 = 0
30-5*d-d-6 = 0
24-6*d = 0 // - 24
-6*d = -24 // : -6
d = -24/(-6)
d = 4
d = 4
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