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d in (-oo:+oo)
7*d-4/5 = 27/10 // - 27/10
7*d-4/5-(27/10) = 0
7*d-4/5-27/10 = 0
7*d-7/2 = 0 // + 7/2
7*d = 7/2 // : 7
d = 7/2/7
d = 1/2
d = 1/2
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