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h in (-oo:+oo)
(3/5)*(h+10) = 9 // - 9
(3/5)*(h+10)-9 = 0
3/5*(h+10)-9 = 0
3/5*(h+10)-9 = 0
3/5*h-3 = 0
3/5*h-3 = 0
3/5*h-3 = 0 // + 3
3/5*h = 3 // : 3/5
h = 3/3/5
h = 5
h = 5
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