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d in (-oo:+oo)
6*d-((2/7)*d)-1/4 = 1273/28 // - 1273/28
6*d-((2/7)*d)-1/4-(1273/28) = 0
(-2/7)*d+6*d-1/4-1273/28 = 0
40/7*d-320/7 = 0 // + 320/7
40/7*d = 320/7 // : 40/7
d = 320/7/40/7
d = 8
d = 8
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