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h in (-oo:+oo)
2/9 = 4*h // - 4*h
2/9-(4*h) = 0
2/9-4*h = 0
2/9-4*h = 0 // - 2/9
-4*h = -2/9 // : -4
h = -2/9/(-4)
h = 1/18
h = 1/18
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