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h in (-oo:+oo)
20/6 = h/3 // - h/3
20/6-(h/3) = 0
10/3-1/3*h = 0 // - 10/3
-1/3*h = -10/3 // : -1/3
h = -10/3/(-1/3)
h = 10
h = 10
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