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h in (-oo:+oo)
-9 = h/12+5 // - h/12+5
-(h/12)-9-5 = 0
-1/12*h-14 = 0 // + 14
-1/12*h = 14 // : -1/12
h = 14/(-1/12)
h = -168
h = -168
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