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d in (-oo:+oo)
67-((3/4)*d) = 85 // - 85
67-((3/4)*d)-85 = 0
(-3/4)*d-85+67 = 0
-3/4*d-18 = 0 // + 18
-3/4*d = 18 // : -3/4
d = 18/(-3/4)
d = -24
d = -24
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