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h in (-oo:+oo)
(1/3)*(6-(9*h)) = h/3-6 // - h/3-6
(1/3)*(6-(9*h))-(h/3)+6 = 0
(1/3)*(6-9*h)-(h/3)+6 = 0
1/3*(6-9*h)-h/3+6 = 0
(1/3*3*(6-9*h))/3-h/3+(3*6)/3 = 0
1/3*3*(6-9*h)-h+3*6 = 0
6-10*h+18 = 0
24-10*h = 0
(24-10*h)/3 = 0
(24-10*h)/3 = 0 // * 3
24-10*h = 0
24-10*h = 0 // - 24
-10*h = -24 // : -10
h = -24/(-10)
h = 12/5
h = 12/5
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