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h in (-oo:+oo)
2*(h-(3/5)) = 1/2 // - 1/2
2*(h-(3/5))-(1/2) = 0
2*(h-3/5)-1/2 = 0
(2^2*(h-3/5))/2-1/2 = 0
2^2*(h-3/5)-1 = 0
4*h-17/5 = 0
(4*h-17/5)/2 = 0
(4*h-17/5)/2 = 0 // * 2
4*h-17/5 = 0
4*h-17/5 = 0 // + 17/5
4*h = 17/5 // : 4
h = 17/5/4
h = 17/20
h = 17/20
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