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d in (-oo:+oo)
-(2*d)-6 = 5*d+64 // - 5*d+64
-(2*d)-(5*d)-64-6 = 0
-2*d-5*d-64-6 = 0
-7*d-70 = 0 // + 70
-7*d = 70 // : -7
d = 70/(-7)
d = -10
d = -10
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