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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 = 0
(-4*d)/15 = 0
(-4*d)/15 = 0 // * 15
-4*d = 0
-4*d = 0 // : -4
d = 0
d = 0
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