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d in (-oo:+oo)
(2/5)*(d-10)-((2/3)*(d+6)) = 0
(2/5)*(d-10)+(-2/3)*(d+6) = 0
2/5*(d-10)-2/3*(d+6) = 0
2/5*(d-10)-2/3*(d+6) = 0
-4/15*d-8 = 0
-4/15*d-8 = 0
-4/15*d-8 = 0 // + 8
-4/15*d = 8 // : -4/15
d = 8/(-4/15)
d = -30
d = -30
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