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d in (-oo:+oo)
3*d+3/7 = 234/7 // - 234/7
3*d+3/7-(234/7) = 0
3*d+3/7-234/7 = 0
3*d-33 = 0 // + 33
3*d = 33 // : 3
d = 33/3
d = 11
d = 11
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