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h in (-oo:+oo)
(2/5)*h-1 = 2*h+3 // - 2*h+3
(2/5)*h-(2*h)-3-1 = 0
(2/5)*h-2*h-3-1 = 0
-8/5*h-4 = 0 // + 4
-8/5*h = 4 // : -8/5
h = 4/(-8/5)
h = -5/2
h = -5/2
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