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d in (-oo:+oo)
-27/7 = (6/7)*d+(1/4)*d+5 // - (6/7)*d+(1/4)*d+5
-((6/7)*d)-((1/4)*d)-27/7-5 = 0
(-6/7)*d+(-1/4)*d-27/7-5 = 0
-31/28*d-62/7 = 0 // + 62/7
-31/28*d = 62/7 // : -31/28
d = 62/7/(-31/28)
d = -8
d = -8
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