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d in (-oo:+oo)
-(7*d)-3 = 6*d+75 // - 6*d+75
-(7*d)-(6*d)-75-3 = 0
-7*d-6*d-75-3 = 0
-13*d-78 = 0 // + 78
-13*d = 78 // : -13
d = 78/(-13)
d = -6
d = -6
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