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d in (-oo:+oo)
28 = (2/7)*(d-6) // - (2/7)*(d-6)
28-((2/7)*(d-6)) = 0
(-2/7)*(d-6)+28 = 0
28-2/7*(d-6) = 0
28-2/7*(d-6) = 0
208/7-2/7*d = 0
208/7-2/7*d = 0
208/7-2/7*d = 0 // - 208/7
-2/7*d = -208/7 // : -2/7
d = -208/7/(-2/7)
d = 104
d = 104
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