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h in (-oo:+oo)
3*h = 7*(2/7-(3/7))-10 // - 7*(2/7-(3/7))-10
3*h-(7*(2/7-(3/7)))+10 = 0
3*h-7*(2/7-3/7)+10 = 0
3*h+11 = 0 // - 11
3*h = -11 // : 3
h = -11/3
h = -11/3
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