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h in (-oo:+oo)
20-40 = (28/3)*(h-6) // - (28/3)*(h-6)
20-((28/3)*(h-6))-40 = 0
(-28/3)*(h-6)-40+20 = 0
20-28/3*(h-6)-40 = 0
20-28/3*(h-6)-40 = 0
16-28/3*h+20 = 0
36-28/3*h = 0
36-28/3*h = 0
36-28/3*h = 0 // - 36
-28/3*h = -36 // : -28/3
h = -36/(-28/3)
h = 27/7
h = 27/7
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