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h in (-oo:+oo)
(2/7)*h-10 = h-20 // - h-20
(2/7)*h-h-10+20 = 0
10-5/7*h = 0 // - 10
-5/7*h = -10 // : -5/7
h = -10/(-5/7)
h = 14
h = 14
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