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h in (-oo:+oo)
(9/2)*h = 20/1 // - 20/1
(9/2)*h-(20/1) = 0
(9/2)*h-20 = 0
9/2*h-20 = 0 // + 20
9/2*h = 20 // : 9/2
h = 20/9/2
h = 40/9
h = 40/9
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