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d in (-oo:+oo)
(1/4)*(d-2)+(1/6)*d+2/3 = 0
1/4*(d-2)+d/6+2/3 = 0
(1/4*3*6*(d-2))/(3*6)+(3*d)/(3*6)+(2*6)/(3*6) = 0
1/4*3*6*(d-2)+3*d+2*6 = 0
15/2*d-9+12 = 0
15/2*d+3 = 0
(15/2*d+3)/(3*6) = 0
(15/2*d+3)/(3*6) = 0 // * 3*6
15/2*d+3 = 0
15/2*d+3 = 0 // - 3
15/2*d = -3 // : 15/2
d = -3/15/2
d = -2/5
d = -2/5
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