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d in (-oo:+oo)
4*d-8 = -28/5 // + -28/5
4*d-(-28/5)-8 = 0
4*d+28/5-8 = 0
4*d-12/5 = 0 // + 12/5
4*d = 12/5 // : 4
d = 12/5/4
d = 3/5
d = 3/5
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