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d in (-oo:+oo)
d/3.2+6 = 21 // - 21
d/3.2-21+6 = 0
0.3125*d-15 = 0 // + 15
0.3125*d = 15 // : 0.3125
d = 15/0.3125
d = 48
d = 48
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