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d in (-oo:+oo)
5 = (d+8)/7 // - (d+8)/7
5-((d+8)/7) = 0
(-1*(d+8))/7+5 = 0
(-1*(d+8))/7+(5*7)/7 = 0
5*7-1*(d+8) = 0
27-d = 0
(27-d)/7 = 0
(27-d)/7 = 0 // * 7
27-d = 0
27-d = 0 // - 27
-d = -27 // * -1
d = 27
d = 27
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