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h in (-oo:+oo)
1 = 2*h+1/2 // - 2*h+1/2
1-(2*h)-(1/2) = 0
1-2*h-1/2 = 0
1/2-2*h = 0 // - 1/2
-2*h = -1/2 // : -2
h = -1/2/(-2)
h = 1/4
h = 1/4
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