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d in (-oo:+oo)
6 = (3/10)*d-12 // - (3/10)*d-12
6-((3/10)*d)+12 = 0
(-3/10)*d+6+12 = 0
18-3/10*d = 0 // - 18
-3/10*d = -18 // : -3/10
d = -18/(-3/10)
d = 60
d = 60
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