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