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h in (-oo:+oo)
3*h = 7*(2/7-((3/7)*h))-10 // - 7*(2/7-((3/7)*h))-10
3*h-(7*(2/7-((3/7)*h)))+10 = 0
3*h-7*((-3/7)*h+2/7)+10 = 0
3*h-7*(2/7-3/7*h)+10 = 0
3*h-7*(2/7-3/7*h)+10 = 0
6*h-2+10 = 0
6*h+8 = 0
6*h+8 = 0
6*h+8 = 0 // - 8
6*h = -8 // : 6
h = -8/6
h = -4/3
h = -4/3
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