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h in (-oo:+oo)
(1/2)*(10*h-6) = -23 // + 23
(1/2)*(10*h-6)+23 = 0
1/2*(10*h-6)+23 = 0
1/2*(10*h-6)+23 = 0
5*h+20 = 0
5*h+20 = 0
5*h+20 = 0 // - 20
5*h = -20 // : 5
h = -20/5
h = -4
h = -4
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