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d in (-oo:+oo)
12-((2*d)/5) = 6 // - 6
12-((2*d)/5)-6 = 0
(-2/5)*d-6+12 = 0
6-2/5*d = 0 // - 6
-2/5*d = -6 // : -2/5
d = -6/(-2/5)
d = 15
d = 15
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