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h in (-oo:+oo)
(-9/5)*h = 8 // - 8
(-9/5)*h-8 = 0
-9/5*h-8 = 0 // + 8
-9/5*h = 8 // : -9/5
h = 8/(-9/5)
h = -40/9
h = -40/9
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