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h in (-oo:+oo)
-((1/4)*h)-13 = 7 // - 7
-((1/4)*h)-13-7 = 0
(-1/4)*h-13-7 = 0
-1/4*h-20 = 0 // + 20
-1/4*h = 20 // : -1/4
h = 20/(-1/4)
h = -80
h = -80
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