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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
2/9*h+2 = 0 // - 2
2/9*h = -2 // : 2/9
h = -2/2/9
h = -9
h = -9
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