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h in (-oo:+oo)
2/2-(6*h) = 13/6 // - 13/6
2/2-(6*h)-(13/6) = 0
2/2-6*h-13/6 = 0
-6*h-7/6 = 0 // + 7/6
-6*h = 7/6 // : -6
h = 7/6/(-6)
h = -7/36
h = -7/36
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