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h in (-oo:+oo)
(-1/2)*h-h+4 = 13 // - 13
(-1/2)*h-h-13+4 = 0
-3/2*h-9 = 0 // + 9
-3/2*h = 9 // : -3/2
h = 9/(-3/2)
h = -6
h = -6
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