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d in (-oo:+oo)
d/3 = 1.4 // - 1.4
d/3-1.4 = 0
1/3*d-1.4 = 0 // + 1.4
1/3*d = 1.4 // : 1/3
d = 1.4/1/3
d = 4.20000004
d = 4.20000004
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