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d in (-oo:+oo)
3*d-2/3 = 79/3 // - 79/3
3*d-2/3-(79/3) = 0
3*d-2/3-79/3 = 0
3*d-27 = 0 // + 27
3*d = 27 // : 3
d = 27/3
d = 9
d = 9
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