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h in (-oo:+oo)
(1/3)*(2*h-9) = 2*h-(3/8) // - 2*h-(3/8)
(1/3)*(2*h-9)-(2*h)+3/8 = 0
(1/3)*(2*h-9)-2*h+3/8 = 0
1/3*(2*h-9)-2*h+3/8 = 0
(1/3*8*(2*h-9))/8+(-2*8*h)/8+3/8 = 0
1/3*8*(2*h-9)-2*8*h+3 = 0
3-32/3*h-24 = 0
-32/3*h-21 = 0
(-32/3*h-21)/8 = 0
(-32/3*h-21)/8 = 0 // * 8
-32/3*h-21 = 0
-32/3*h-21 = 0 // + 21
-32/3*h = 21 // : -32/3
h = 21/(-32/3)
h = -63/32
h = -63/32
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