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d in (-oo:+oo)
3*d-(31/5) = -2 // + 2
3*d-(31/5)+2 = 0
3*d-31/5+2 = 0
3*d-21/5 = 0 // + 21/5
3*d = 21/5 // : 3
d = 21/5/3
d = 7/5
d = 7/5
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