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