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h in (-oo:+oo)
70 = 10*(1/2)*h // - 10*(1/2)*h
70-(10*(1/2)*h) = 0
70-5*h = 0
70-5*h = 0 // - 70
-5*h = -70 // : -5
h = -70/(-5)
h = 14
h = 14
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