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h in (-oo:+oo)
5/9 = h/21 // - h/21
5/9-(h/21) = 0
5/9-1/21*h = 0 // - 5/9
-1/21*h = -5/9 // : -1/21
h = -5/9/(-1/21)
h = 35/3
h = 35/3
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