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h in (-oo:+oo)
-9*h = ((1/2)/1)/9 // - ((1/2)/1)/9
-9*h-(((1/2)/1)/9) = 0
-9*h-1/18 = 0
-9*h-1/18 = 0 // + 1/18
-9*h = 1/18 // : -9
h = 1/18/(-9)
h = -1/162
h = -1/162
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