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h in (-oo:+oo)
4/9 = h/21 // - h/21
4/9-(h/21) = 0
4/9-1/21*h = 0 // - 4/9
-1/21*h = -4/9 // : -1/21
h = -4/9/(-1/21)
h = 28/3
h = 28/3
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