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d in (-oo:+oo)
(2/5)*(d-10)-((2/3)*(d-9)) = 0
(2/5)*(d-10)+(-2/3)*(d-9) = 0
2/5*(d-10)-2/3*(d-9) = 0
2/5*(d-10)-2/3*(d-9) = 0
2-4/15*d = 0
2-4/15*d = 0
2-4/15*d = 0 // - 2
-4/15*d = -2 // : -4/15
d = -2/(-4/15)
d = 15/2
d = 15/2
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