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d in (-oo:+oo)
12 = (5*d)/6+7 // - (5*d)/6+7
12-((5*d)/6)-7 = 0
(-5/6)*d-7+12 = 0
5-5/6*d = 0 // - 5
-5/6*d = -5 // : -5/6
d = -5/(-5/6)
d = 6
d = 6
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