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h in (-oo:+oo)
(1/2)*(2*h-4) = 20 // - 20
(1/2)*(2*h-4)-20 = 0
1/2*(2*h-4)-20 = 0
1/2*(2*h-4)-20 = 0
h-22 = 0
h-22 = 0
h-22 = 0 // + 22
h = 22
h = 22
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