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d in (-oo:+oo)
3*d+5 = 13/5 // - 13/5
3*d-(13/5)+5 = 0
3*d-13/5+5 = 0
3*d+12/5 = 0 // - 12/5
3*d = -12/5 // : 3
d = -12/5/3
d = -4/5
d = -4/5
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