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d in (-oo:+oo)
-(3*d)-6 = -36 // + 36
36-(3*d)-6 = 0
36-3*d-6 = 0
30-3*d = 0 // - 30
-3*d = -30 // : -3
d = -30/(-3)
d = 10
d = 10
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