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h in (-oo:+oo)
(1/4)*h+13 = 22.5 // - 22.5
(1/4)*h-22.5+13 = 0
1/4*h-9.5 = 0 // + 9.5
1/4*h = 9.5 // : 1/4
h = 9.5/1/4
h = 38
h = 38
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