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h in (-oo:+oo)
7*(2/7-((3/7)*h))-10 = 0
7*((-3/7)*h+2/7)-10 = 0
7*(2/7-3/7*h)-10 = 0
7*(2/7-3/7*h)-10 = 0
-3*h-8 = 0
-3*h-8 = 0
-3*h-8 = 0 // + 8
-3*h = 8 // : -3
h = 8/(-3)
h = -8/3
h = -8/3
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