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h in (-oo:+oo)
3-(6*h) = -13/6 // + -13/6
3-(6*h)-(-13/6) = 0
13/6-6*h+3 = 0
31/6-6*h = 0 // - 31/6
-6*h = -31/6 // : -6
h = -31/6/(-6)
h = 31/36
h = 31/36
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