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d in (-oo:+oo)
(7/5)*(d+6) = 2/5-d // - 2/5-d
(7/5)*(d+6)+d-(2/5) = 0
(7/5)*(d+6)+d-2/5 = 0
7/5*(d+6)+d-2/5 = 0
(7/5*5*(d+6))/5+(5*d)/5-2/5 = 0
7/5*5*(d+6)+5*d-2 = 0
12*d-2+42 = 0
12*d+40 = 0
(12*d+40)/5 = 0
(12*d+40)/5 = 0 // * 5
12*d+40 = 0
12*d+40 = 0 // - 40
12*d = -40 // : 12
d = -40/12
d = -10/3
d = -10/3
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