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h in (-oo:+oo)
56 = (1/4)*h // - (1/4)*h
56-((1/4)*h) = 0
(-1/4)*h+56 = 0
56-1/4*h = 0 // - 56
-1/4*h = -56 // : -1/4
h = -56/(-1/4)
h = 224
h = 224
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