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d in (-oo:+oo)
(1/6)*d+2/3 = (1/4)*(d-2) // - (1/4)*(d-2)
(1/6)*d-((1/4)*(d-2))+2/3 = 0
(-1/4)*(d-2)+(1/6)*d+2/3 = 0
d/6-1/4*(d-2)+2/3 = 0
(-1/4*3*6*(d-2))/(3*6)+(3*d)/(3*6)+(2*6)/(3*6) = 0
3*d-1/4*3*6*(d-2)+2*6 = 0
9-3/2*d+12 = 0
21-3/2*d = 0
(21-3/2*d)/(3*6) = 0
(21-3/2*d)/(3*6) = 0 // * 3*6
21-3/2*d = 0
21-3/2*d = 0 // - 21
-3/2*d = -21 // : -3/2
d = -21/(-3/2)
d = 14
d = 14
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