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d in (-oo:+oo)
-(5*d)-7 = -67 // + 67
67-(5*d)-7 = 0
67-5*d-7 = 0
60-5*d = 0 // - 60
-5*d = -60 // : -5
d = -60/(-5)
d = 12
d = 12
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