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d in (-oo:+oo)
3*d+4/7 = 4 // - 4
3*d+4/7-4 = 0
3*d-24/7 = 0 // + 24/7
3*d = 24/7 // : 3
d = 24/7/3
d = 8/7
d = 8/7
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