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h in (-oo:+oo)
(1/5)*h = 6.4 // - 6.4
(1/5)*h-6.4 = 0
1/5*h-6.4 = 0 // + 6.4
1/5*h = 6.4 // : 1/5
h = 6.4/1/5
h = 32
h = 32
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