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d in (-oo:+oo)
d-12 = (8/10)*d // - (8/10)*d
d-((8/10)*d)-12 = 0
d+(-4/5)*d-12 = 0
1/5*d-12 = 0 // + 12
1/5*d = 12 // : 1/5
d = 12/1/5
d = 60
d = 60
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