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d in (-oo:+oo)
7*d-((5/7)*d)-3 = 199/7 // - 199/7
7*d-((5/7)*d)-(199/7)-3 = 0
7*d+(-5/7)*d-199/7-3 = 0
44/7*d-220/7 = 0 // + 220/7
44/7*d = 220/7 // : 44/7
d = 220/7/44/7
d = 5
d = 5
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