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d in (-oo:+oo)
d+d/3-10 = 21 // - 21
d+d/3-21-10 = 0
4/3*d-31 = 0 // + 31
4/3*d = 31 // : 4/3
d = 31/4/3
d = 93/4
d = 93/4
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