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d in (-oo:+oo)
(1/2)*d-2*d+6/7 = -177/14 // + -177/14
(1/2)*d-2*d+6/7-(-177/14) = 0
(1/2)*d-2*d+6/7+177/14 = 0
27/2-3/2*d = 0 // - 27/2
-3/2*d = -27/2 // : -3/2
d = -27/2/(-3/2)
d = 9
d = 9
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