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d in (-oo:+oo)
(3/4)*d+(2/7)*d+2/3 = 115/42 // - 115/42
(3/4)*d+(2/7)*d+2/3-(115/42) = 0
(3/4)*d+(2/7)*d+2/3-115/42 = 0
29/28*d-29/14 = 0 // + 29/14
29/28*d = 29/14 // : 29/28
d = 29/14/29/28
d = 2
d = 2
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