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d in (-oo:+oo)
3*d+3/5 = 3 // - 3
3*d+3/5-3 = 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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