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h in (-oo:+oo)
6-((2/7)*h) = -3 // + 3
3-((2/7)*h)+6 = 0
(-2/7)*h+3+6 = 0
9-2/7*h = 0 // - 9
-2/7*h = -9 // : -2/7
h = -9/(-2/7)
h = 63/2
h = 63/2
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