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h in (-oo:+oo)
h/5 = 28/70 // - 28/70
h/5-(28/70) = 0
h/5-2/5 = 0
1/5*h-2/5 = 0 // + 2/5
1/5*h = 2/5 // : 1/5
h = 2/5/1/5
h = 2
h = 2
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