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d in (-oo:+oo)
-7 = (3/8)*d+5 // - (3/8)*d+5
-((3/8)*d)-7-5 = 0
(-3/8)*d-7-5 = 0
-3/8*d-12 = 0 // + 12
-3/8*d = 12 // : -3/8
d = 12/(-3/8)
d = -32
d = -32
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