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h in (-oo:+oo)
-20 = (2/3)*h+10 // - (2/3)*h+10
-((2/3)*h)-20-10 = 0
(-2/3)*h-20-10 = 0
-2/3*h-30 = 0 // + 30
-2/3*h = 30 // : -2/3
h = 30/(-2/3)
h = -45
h = -45
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