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d in (-oo:+oo)
-(7*d)-4 = d-68 // - d-68
68-(7*d)-d-4 = 0
68-7*d-d-4 = 0
64-8*d = 0 // - 64
-8*d = -64 // : -8
d = -64/(-8)
d = 8
d = 8
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