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d in (-oo:+oo)
d/4.5 = 31.4 // - 31.4
d/4.5-31.4 = 0
0.22222222*d-31.4 = 0 // + 31.4
0.22222222*d = 31.4 // : 0.22222222
d = 31.4/0.22222222
d = 141.30000141
d = 141.30000141
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