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d in (-oo:+oo)
(3/7)*d-(7*d)+5 = -11/7 // + -11/7
(3/7)*d-(7*d)-(-11/7)+5 = 0
(3/7)*d-7*d+11/7+5 = 0
46/7-46/7*d = 0 // - 46/7
-46/7*d = -46/7 // : -46/7
d = -46/7/(-46/7)
d = 1
d = 1
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