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d in (-oo:+oo)
-(7*d)-2 = 75 // - 75
-(7*d)-75-2 = 0
-7*d-75-2 = 0
-7*d-77 = 0 // + 77
-7*d = 77 // : -7
d = 77/(-7)
d = -11
d = -11
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