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h in (-oo:+oo)
h-(h/4)-((2*h)/5)+1/4-(3/5)-1 = 0
h-(h/4)+(-2/5)*h+1/4-3/5-1 = 0
7/20*h-27/20 = 0 // + 27/20
7/20*h = 27/20 // : 7/20
h = 27/20/7/20
h = 27/7
h = 27/7
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