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D in (-oo:+oo)
(2/3)*(D+6)-(4*D) = 0
(2/3)*(D+6)-4*D = 0
2/3*(D+6)-4*D = 0
2/3*(D+6)-4*D = 0
4-10/3*D = 0
4-10/3*D = 0
4-10/3*D = 0 // - 4
-10/3*D = -4 // : -10/3
D = -4/(-10/3)
D = 6/5
D = 6/5
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